1) Buddha is not a god, he is a person, just like you and me, he never claimed to be a god, nor did he want to be regarded as one.
2) Buddha is not invisible, all-powerful, and he didn't claim to create the universe, or man, or anything.
3) Buddhism is not a religion, it is a way of life, and most Buddhists are atheists, although some may also belong to a religious group (including Christianity)