Muhd,
Because if I'm right then they would have to change their lifestyle to a more godly one. Which is something some atheists are not willing to do, so they are forced to believe there is no god.
I'm not forced not to believe in a god. There's no evidence of one or more, so not believing in a god is incredibly easy. You can go around with the firm belief in unicorns, fairies & munchkins all day long, matey, but the rest of us require a little more.
Secondly, what makes you think that whatever gods may exist require any moral standards from us whatsoever? What even makes you think they are even aware of us? You are rather assuming that if a god/s exist, that it is your god, non?
Mark
There are 10 kinds of people in this world; those that understand binary, & those that don't