It's pretty simple really. God makes true Christians and you can recognize them by their fruits of the Spirit. Galatians 5:22-23
The reason it appears that there are fundamental differences between beliefs is because we're all learning about God together, through Jesus Christ who is the perfect image of God. The moment one looks away from Christ, but still tries to learn about God is the moment they begin to believe false things and this becomes apparent in the things they say regarding the truth about God, which can only be understood through the sound teaching of our Lord Jesus Christ and the Saints under him.
Look to Jesus Christ and confess and repent and you will come to know the love of God that surpasses all human knowledge. If you feel you have the fruit of the Spirit you will know that what I'm saying is true. Many on these forums cannot recognize this simple truth because of their hardened hearts. I continue to pray for them and I pray for you, pray for me as well
May God strengthen us through Jesus Christ.