Not all religious ideas involve having a god. And of those, not all involve having a personal god.
In any case, I’d argue that the best reason for religion is that it helps people to find meaning in the real world. The myths are about how people live and why. Meaning is subjective and can’t be taken away from you. But the potential fallacy is that religious meaning is not a history lesson, it’s about the internal world of experience rather than the external one. When people make the mistake of treating allegory literally, then they miss it’s point and assume a lot of funny things. It’s like sucking the finger instead of looking where it points to.
Everybody is “a scientist”, because they live in and observe the real world. It affects you. So, living in it, there is some incentive to know what’s going on and make the best possible decisions, knowing what you do at the time. There is no final “proof” of anything to strive for. Our best knowledge about the world is a tool which helps us now. It’s no tragedy that this doesn’t help our descendants, because they will have their own tools, and their own decisions to make.