I am a nonbeliever myself. But I think there's so much about religion that is not factual in nature as to why people engage with it and what it means to them. You can debunk why you think there's no physical evidence for God and why the story of Jesus didn't really happen that way and stuff like that all the live-long day, and it's not going to make a difference to what role religion has in people's lives and how they feel about it and how it makes their lives better or worse.