Why do ppl talk about God and Jesus if they dont believe in them?

I find it funny when people talk madd krap about God or the bible or people who believe in God when theyre jus running their mouth about something they dnt evn believe in! I mean if they rlly ddnt believ in God then why would they say he doesnt exist or stuff like tht?uhh HELLOO!OBVIOUSY IF YOU TALK ABOUT GOD THN YOU MUST BELIEVE IN HIM OR THINK THEIRS SOMETHNG THERE RIGHT!cause if you really ddnt believe in him thn you wouldnt have nothing to say!i dnt hear nobody complaining about zeus and all these other gods tht never truly existed...or do you rlly believe they did? so do yourself a favor and shut yer mouths:)