I'm not sure people who believe a virgin had a baby have much room to criticize people who believe in magic underwear
I am sure that posters who run on about things they don't understand, are not very bright, since they post only for the purpose of insulting people unnecessarily.
When I was younger, and much dumber, I was a nonbeliever. I would tell some religious jokes, usually among other nonbelievers, but I would never even imagine insulting a person who did believe. That would be rude, and a violation of my belief in live and let live.
Even then, I recognized that no evidence existed, pro or con, on the existance of God, or the validity of the Bible. The belief that there is no God is just as faith based as the belief that there is a God. If there is a God, then his powers would explain every magic trick that you love to make fun of.