Hi McGee,
When I became a Christian I didn't know anything about the Lord. I know I would say in my BC days that there must be a god, but I sure didn't know what I was talking about at all.
When I received Jesus as my Lord and Savior, I only knew that there was God and there was His Son, and that somehow His Son took my sins away.
It was only later that I realized Jesus was God. And it was through reading the word, studying it and attending church and bible studies. I can't tell you when I came to know Jesus was God. It wasn't emphasized to me as a new believer. I think we all assume new believers just know that.
Some Christians are in a denomination that don't teach Jesus is God. So for years they believe what they are being taught. Without reading the word on their own, or studying the word, they can easily be deceived. But even if they are reading the word, their denominational influence won't allow for them to interpret the scriptures correctly.
I certainly didn't know about the trinity either until later.
After one thread here that spoke of the Trinity and hearing what others had to say about it, there were some who posted that didn't believe in the trinity. And some unkind words were flung at those who said they don't believe that doctrine.
And yet, it seems like they love God and live His truth. On here though it's hard to really discern that, but at face value it appears that some on here who don't believe in the Trinity are believers. The same goes for those who don't know yet that Jesus is God.
I'm going to give Christians the benefit of the doubt and accept them as a believer who just doesn't know yet. I think it's a good thing to show scriptures as you are doing McGee.
They need to be told and need to shown through God's word that there's a Trinity and that Jesus is God. After showing them, it still may take a while for them to come to the knowledge of the truth of the Trinity and the Deity of Christ. But if the rest of their doctrine and way of living/speaking seems genuine, they truly might be a Christian and just aren't understanding those 2 things yet.
But God gives the discernment of spirits as a gift and it could be that they're being deceived by Satan and are one of His that come to deceive the brothers and sisters in Christ. We do need to watch out for that and not allow people to come on here teaching false doctrine without refuting the lies of the enemy.
So...
it can be immaturity
it can be they're in the wrong denomination
it could be they are young in the Lord, a babe in Christ
it could be a spouse's influence
It could be a number of things. But they need to hear the truth and sometimes we have to be patient and allow the Lord to work in them. The Holy Spirit will lead and guide them into all truth if they genuinely believe.