God literally does not matter because a world with god is apparently identical to a world without god.
The universe appears to be a cold, deterministic, ammoral place. 99.99999999.....% of it is cold, lifeless, uninhabitable and desolate. The remaining tiny portion that has life, has life that depends on violence, disease, death, pain, and fear in order to exist on a small sphere that is constantly attempting to kill the things living on it. Theologians and philosophers have spent centuries trying to explain why god wants the universe to be like that. The atheists of society have for centuries said of course that's the way the universe looks, there is no purpose in it. A universe with god, apparently is identical to a universe without god.
Morality with god, is the same as morality without god. That is to say (as mentioned above) it seems to keep in lock step with the prejudices of society. During the slave era of the USA, the bible was used to both promote and denounce slavery. In Modern times the bible is used to both promote tolerance of homosexuality and condemn it. The bible gives permission to stone, and the command to forgive. As studies have shown, people believe that god wants whatever they want. God is a tool for justifying one's prejudices. And as other studies have shown, an individuals morals and concience are pliable based on social pressure. Without god morality would be set by society, with god people's view of the bible changes with society. Morality with a god looks exactly the same as morality without god.
So why does god matter? Because when you die, blah blah blah. It's a sad pascals wager, which doesn't work.
A more interesting question is "If there is a god, why does he work so hard to make us doubt it?" Now that is a topic for conversation.