Well, here's a thought: If you engage in conversation with an avowed atheist/agnostic, ask them whether they hope they are right. Do they hope that there is no God, or would they prefer that there be a God? Would they rather be right or wrong?
But here's the most important thing: It is far, far better to live one's life AS THOUGH there were a god, and furthermore, AS THOUGH a virtuous life were rewarded in the afterlife and an evil life punished in the afterlife (or extinguished, as some believers believe).
Otherwise, one might live an entire life of kindness, generosity, compassion, and love,and in the end it is all for nothing. Conversely, Adolf Hitler gets the same "reward" as St Francis of Assisi.
Is that what you WANT for the universe? See my second paragraph.