I get tired of seeing believers post "Why I Believe in Y'shua" subjects in "Why I DON't Believe In Y'shua." Leave the "DON'T Believe" posts for people like shlomo, Sheitl Queen, and Chaim ben Yaakov. I sometimes get confused with who believes and who doesn't.
If you are getting confused, it may be more a matter of being able to comprehend what is being written by the given person. This is an ongoing process and takes time, so be patient with yourself and the poster too.
Do more investigating about what the person is claiming, to make sure they are saying what you think they are saying.
Finally, I would suggest that you attack the issue, not the person. Sometimes I veer from that way of discussing, and the spotlight gets taken off the Lord Jesus and onto whatever. The temptation is strong to do that.
I hope this is encouraging to you, so that you won't worry about something you cannot control and don't resort to complaining.
But why would a believer start a, not just respond to another, thread in the non-believer's forum. Why start a belief argument in a non-believer's forum?