100% agree about human-made religion.

What's far more interesting and mysterious is "God", which is distinct from the human-centric nature and human-created Religion, but of course are often used interchangeably.

For me, God is a placeholder for all my brain cannot grasp (perhaps even in principle), all the empirical tools of Science is unable to touch, and even the arguments in philosophy cannot resolve.

For example, consider the ultimate metaphysical question: Why is there Something Rather Than Nothing?

How do we even begin here?

We can artificially solve it by saying it's just the God of Religion X, but that's basically creating an artificial explanation and then saying we're done.

Digging deeper, "something" can come from quantum mechanics and other ideas from modern physics. Particles and anti-particles pop out of nothingness according to QM. This is where a working physicist stops or even believes is sufficient, but where did the spacetime where quantum mechanics can act come from?

And if we explain THAT by scientific laws or principles, where did those laws or principles come from? And how do they come from some abstract realm to affect the physical world we can interact with?

This is why I'm interested in God as a placeholder for the final turtle if the explanations are "turtles all the way down". Relatively, Religion is just so superficial.

Of course, we can talk about religion as a social issue to help organize societies. This is where I can see the practical organizational effect of religion. We don't have to go into the finer points of game theoretical optimizations of why we should behave a certain way for societies to be stable, just say religion commands it and you must obey it. Works well for some things like "Thou Shalt Not Kill", but terribly outdated, for example, for gender roles in the information age.