Why Do Christians Ignore some of Jesus' Teachings?

Jesus told His disciples to sell their properties and give alms; told them to wash (literally) one another's feet; to obey the scribes and Pharisees; perform sacrifices according to the Law; etc. Through His personal example Jesus taught us to keep the Sabbath and observe the festivals.

Jesus said: whoever breaks one of the least of the commandments and teaches people to do so will be called least in the kingdom of heaven.

The Lord (while He was on earth) also said that only a few will be saved and yet we all seem to ignore it. Why?

For simple reasons:

1. Most christians arent jews living under sanhedrin. Not born into the covenant of circumcision and therefore not jewish, and not obligated to obey the scribes and pharisees
2. Christians arent first century apostles at the start of the church
3. Selling property and living in a commune works in small numbers, but with a billion people (even 20 000) it starts to fall apart real quick.
4. Washing feet, yeah dont know why we dont do this. I dont do it because I dont want no foot fungus on my hands, hows that? I'll do it with gloves on?
5. Jesus did keep the sabbath and festivals, but Jesus was also circumcised and kept the Torah, (all of what was applicable to Him) should we do that as well? I dont think you are aware what you are getting into. Let me tell you bro, its a lot of work. I "keep" the sabbath, but I realize its not keeping it in a BIBLICAL way, because the Bible way is that your entire city needs to be on shutdown, and goood luck convincing everyone to not work on sabbath. And what do we do with the ones who DISOBEY the commandment? I think you know the answer, and that wouldn't fly in today's society, either.
6. I see no harm in "keeping" the festivals or sabbath, its great. However the problem is: WE CANNOT keep them BIBLICALLY as i've stated. I often wonder (no disrespect to you personally) if the people who advocate this torah obedience thing have ever actually READ the Torah? You know, all the ANIMAL SACRIFICES and other things that go with the feasts?
Many of them also require you to show up at Jerusalem, so you better pack up and move there.
This is why many hebrew roots people half-way keep them.
7. I dont think Christians ignore the verse that states few will be saved, i've heard that quoted in sermons a bunch of times. (Pentecostal)

You have a point there!

Have you sold all your property? (which would include everything you own) are you obeying the pharisees? Are you still sacrificng animals according to the law of God?

I only ask because you mentioned these in your post.

As for obeying Gods commands. I do not know anyone who thinks it is ok not to obey Gods moral law.. I do however think some take when people say they do not think they can FULFILL it, to mean they think it is ok to disobay it.

Doctrines for the church, the body of Christ, would come through the Apostle Paul through the abundant of revelations given by Jesus Christ. What Christ taught Paul through these revelations is NT doctrine. The NT does not start until after the death of the testator, Jesus Christ.

No, I haven't sold my property and don't intend to -- I don't keep the commandments as Jesus told us to do. Notice that Jesus never said keep the moral laws, He told us the keep the whole Law.

No one can keep the whole law. So why would Jesus telss us to do somethign we can not.

And where did He say WHOLE law?

While I don't think He want's us to sell all our property, He expects us to be using it to help others. If our priorities are centered in getting ahead in this world with money and things and not with Him, than it would be better to get rid of it all.

I think washing the feet of another, can be fulfilled by serving one another.

I believe He told us all the laws are fulfilled if we Love Him and others as we are called.

Few of us do, and I think the narrow gate warns us to guard our softened hearts so we will love as we are called. It isn't always easy, though. We need Him to help us, desperately.

Amen

I think God told that man to sell all he had to prove to the man he still had priorities which did not meet with Gods (he claimed he was perfect. Yet he coveted goods, which was breaking the law)

Washing feet. An impotant message. We need to stop worrying about self and our needs and get down and dirty and meet the needs of those around us. No matter what position we hold in the church.

Amen, Love fulfills the law and prophets. If we love someone truly, we will not sin against them. We will instead serve them, doing this there will be no sin.

And yes, As paul said in romans 7. We do not always do what we want, there are times our flesh wins.. We must keep fighting, keep persevering, keep walking that path. And NEVER think we have made it.

I think you are very close to the truth here.
God’s ideal is to put others above self in all things and every aspect of life. That is how we honor God.
As mortal beings we cannot and are for the most part unwilling to do this. We cannot be perfect and that is our sin. Jesus can set the ideals of what it is to serve God but only through him can we attempt to do so.
His death on the cross made our attempts good enough.

I believe that some of Jesus' teachings were contextual/circumstantial, like the story of the rich young ruler. God asks us to give our whole hearts to Him, but He may not ask us to sell all our goods like He did with the rich man. Abraham was never condemned for being rich, nor King David, because their hearts and goods belonged to God and were used for His glory.
I also believe that many of the Levitical laws were pointing toward Jesus, and were fulfilled in Him. For example, sacrificing a lamb pointed to His death, and when He gave Himself as a sacrifice this put an end to the "shadow" sacrifices that had pointed to Him. (Hebrews 10:1)
As for the Sabbath, it was instituted at Creation along with marriage, and I believe that it has always been and always will be a part of God's eternal law (the Ten Commandments) which never change because they are a transcript of His character (Matt. 5:17-19, Malachi 3:6). Adam and Eve kept it, Jesus kept it, the apostles kept it by resting "according to the commandment," (Luke 23:56; Acts 13:14, 17:2) and Isaiah prophecies keeping the seventh-day Sabbath in Heaven as well (Is. 66:22-23).

Overall, I think it's important to look at Jesus' teachings and consider whether we're personally following them in our lives, whether they are to be literally applied (I believe that giving to the poor should be literal and tangible), or whether it is a matter of the heart (are we idolizing our wealth or is it consecrated to God). It helps us search our hearts and decide if we're "doers" and not just "hearers" (James 1:22).

That's what I'm attempting to find out: Why did Jesus tell the disciples to keep the law of Moses?

And he meant the whole law. See Matthew 5:19.

whoever breaks one of the least of the commandments and teaches people to do so will be called least in the kingdom of heaven.

Don't you think it all comes up to this....love Him with all we have, thus love others too?

Don't you think if we do so, we will be following and teaching what we are called, all of Him and His instructions?

This is what many elders in my denomination teach, but is not what the Lord taught when He was on earth. Notice that in Acts the disciples did sell what they had and shared the money with the poor.

Hmmmmm, good point. You have me pondering, thank you for that, Brother.

Jesus said: Be perfect, therefore, as your heavenly Father is perfect.

The word there can be translated “Mature” or lacking nothing..

He is not going to tell people to be something they are unable to be.

May I ask why you are asking these questions?

Well I think He is perfecting, establishing and purifying us, that like we read in Jude 1:24-25, He will present us blameless. I think He cuts, ouch, away our impurities and imperfections in our minds, in our hearts, but ultimately our Holiness, our Perfection are His, not ours...

Now to Him who is able to keep you from stumbling, and to make you stand in the presence of His glory blameless with great joy, to the only God our Savior, through Jesus Christ our Lord, be glory, majesty, dominion and authority, before all time and now and forever. Amen.
Jude 1:24‭-‬25 NASB
https://bible.com/bible/100/jud.1.24-25.NASB

That is exactly what he is saying!