And it is your duty to judge who believes and who truly believes?
God judges the heart and knows who truly believes and who does not. I'm just pointing out that not everyone is a genuine believer, even though they think they are. I thought that I was a believer many years ago, was water baptized, but later came to realize that my belief fell short of genuine or consummated belief/faith in Christ resulting in salvation. I've heard several testimonies from others who have said the same thing. I know former Mormons who were water baptized in the LDS church but didn't even believe that Jesus is God at that time, but later came to believe that Jesus is God, received Him through faith, then afterward received water baptism as a genuine believer. Do you believe that it does not really matter what the content of one's belief/faith is? As long as one believes "something" about Jesus or believes that there is one God (James 2:19), that constitutes a "believer" to you?
You cannot apply the action to show belief to one who does not believe.
But not everyone who gets water baptized truly believes, as I already explained to you. Been there, done that and know several others who have been there, done that.
If he believes and is baptised and will be saved....Then the opposite is applied if he does not believe, he does not believe so he will not be baptised therefore he will be (not saved) condemned.
Mark 16:16(b) said nothing about those who are not baptized will be condemned. I already explained to you that there are people who get water baptized but don't truly believe. When I was water baptized prior to my conversion, I believed in the existence of Christ, I believed that He was the Son of God and I believed that His death, burial and resurrection "happened" but I was not believing/trusting in Him as the all sufficient means of my salvation at that time, so my belief/faith fell short of genuine or consummated belief/faith in Christ resulting in salvation.
Why on earth will he be baptised if he does not believe?
Because many people see baptism as the means of their salvation and some simply see it as the way to join their particular church, even though they don't truly believe/trust in Christ as the all sufficient means of their salvation, although they may believe "something" about Christ, they see that as good enough to be considered a believer who is now qualified to be water baptized. Some people even reject the deity of Christ yet still consider themselves "believers" and get water baptized anyway (as I already explained) because that's what they are trusting in for salvation, along with other works.
If Baptism is a sign that we believe. Then if one says he believes and is not baptised is it not a sign that he does not truly believe?
If someone claims to believe yet refuses to be water baptized, I would seriously doubt that they truly believe. I'm yet to meet a genuine believer who refuses to be water baptized. I was water baptized after I received Christ through faith and so was my wife and son and every Christian that I know. Refusing to get water baptized would be like reciting your vows at your wedding and then refusing to exchange rings and put them on your fingers during the ceremony. Makes no sense!
And since we are commanded to be baptised, If you say one can believe and not be baptised isn't that an act of disobedience?
Refusing to get water baptized would be an act of disobedience but what genuine believer would refuse to be water baptized? What about one who truly believes but is om their death bed, on the battle field when they receive Christ through faith but are unable to get water baptized before they die? Will they be saved or are they out of luck because no water is available? If they are unable to get water baptized before they die, does that mean they did not believe?
What happen to baptism? you have just made it null and void.
Made it null and void of what? I'm just simply pointing out that if water baptism is absolutely required for salvation, then why did Jesus not mention it in the following verses? (3:15,16,18; 5:24; 6:29,40,47; 11:25,26). Believing and getting baptized afterwards are obviously two distinct things and Jesus clearly connects believing with receiving eternal life nine different times here, so why would I add the word baptism to those verses if Jesus did not?
If you believe you will be baptised.
Sure, unless you are unable to.
You believe and was baptised.
I certainly was. I couldn't wait to get water baptized. I received Christ through faith late on a Saturday night and was water baptized on Sunday morning. Does that mean between Saturday night and Sunday morning that I was still lost in my sins? I know without a doubt that I had been born again and received the Holy Spirit that night.
If you did not believe you would not have been baptised.
Well, prior to receiving Christ through faith, I was water baptized in a church that taught salvation by works, but was water baptized again after my conversion. Again, at that time, I believed in the existence and historical facts about Christ but I did not believe/trust in Him as the all sufficient means of my salvation. I believed in works salvation. I was not a believer, but got water baptized anyway and so have many others. I hope that someday you will understand exactly what I'm talking about.
Unbelievers don't get baptised.
Atheists are not the only unbelievers. If our belief falls short of trusting exclusively in Christ for salvation, then we are unbelievers, even though we may believe "something" about Christ.
Unbelievers teach not to be baptised.
Unbelievers also teach believe in your baptism and not exclusively in Christ for salvation.
Unbelievers teach baptism is is not for the remission of sins.
Unbelievers teach that believing in Him to receive remission of sins (Acts 10:43) is not good enough and misunderstand that water baptism is in regards to, not in order to obtain, the remission of sins that is received upon repentance/faith (Acts 3:19; 11:17,18; Romans 3:24-26).
Unbelievers teach if you believe and is not baptised you will be saved.
Unbelievers teach that it's the lack of being baptized that causes condemnation regardless of what you believe.