God accepts those who are born again. If they believe different doctrines, it's no big deal. Obviously there are some doctrines that are fundamental. But there is much more that unites us than divides us.
Jesus is the Head of His church. The real church is His body. Jesus knows those who are His. We are all at different stages in our growth. I was adamant about some of my beliefs as a young Christian. I learned a lot, including that my understanding of God's Word can be wrong.
All that is not of Christ will be consumed some day. All that is of Christ will endure for eternity. May I suggest that before you get too deeply into judging others, you make sure that you are qualified to discern what is of Christ and what is not.
For example, once a month, I attend an Anglican church. I get on well with the pastor. I don't agree with all his doctrines. He does not agree with everything I say either. But he is alive in Christ. I used to go to a Baptist church. It's a lot bigger, but not very friendly. I've been to others where I live. I agree with their doctrines to a greater extent, but they are cold and unwelcoming. "The greatest of these is love". How we know that we have passed from death to life? When we love the brethren. God does not have a theological entrance exam to the kingdom of God. He has a spiritual heart monitor. Is your spiritual heart beating? You are accepted. If not, you need a new heart - no matter how accurate your doctrines.