I derive my morality from one simple law: Could the way I act be made into a law for everybody. Or in other words: Don't do what you don't wish others to do. This replaces most of the ten commandments. Not all of them, for sure, but the ones I need for living a socially acceptable and henancing live.
Every religion stemms from a brain. It was a way to explain things humankind couldn't explain at the time. And naturally some of the laws they gave themselves to have a good working society still aply today, for example: don't kill. But others, for example that women are NOT equal to men, have been proven wrong.
I agree, that there can be difficulties during losing your religion, especially if you switch it with another kind of religion. Hitler and Stalin weren't religionless even if they didn't promote christianity. But I have to disagree that humanism can reconcile with religion. Humanism is about the belief in provable facts and the humankind being part of all living things on earth, to name it, we are just an animal like all the others.