Why do atheists always get on the high horse when they refer to circular logic?

I always hear atheists tell christians that we are ignorant, irrational, and use circular logic to back up our faith. Well, to be honest, I dont know what circular logic is and dont care for it is only faith that will please our lord Jesus Christ. It says in the bible that it is impossible to please God without faith. God never mentioned that we should think logically like scientists did he? Of course not. Jesus is the son of God for it has been written in the bible. The bible is the word of God for this has been repeatedly stated throughout the bible. Kind of a no brainer huh? Kinda make you think doesn't it?