Who said anything about random ? Natural selection isn’t random.
And like it or not, the evidence is overwhelming that evolution by natural selection is exactly how we and the rest of the biosphere came to be is overwhelming. The evidence that God did it ? Zero.
Humans don’t fly by flapping wings either, as a rule. We aren’t constrained to do things the way nature does them, and scientists aren’t generally funded to perform experiments using methods that take millions of years. Humans prefer to work a bit faster.
Yes, it is for us to say. If God exists, screw him. He’s bad at the job.
Without belief we are free to make our own choices. Nor are we “mistakes”; by definition, we are the successes ( or at least their descendents ). Without belief, we are also right; believing in God involves either great foolishness or great ignorance.
Without God, there is hope. We have a chance to make the world and ourselves better. WITH God, there is no hope; we are the helpless toys of an egomaniac and will be forever. We are fortunate that there isn’t a God.