"I don't believe in a god" <-- wrong
"I don't care if there's a god or none. It doesn't matter. It doesn't stop you or is needed to be a responsible, caring, compassionate human being." <-- correct
"I don't believe in a god" <-- wrong
"I don't care if there's a god or none. It doesn't matter. It doesn't stop you or is needed to be a responsible, caring, compassionate human being." <-- correct