After about fifty years of spiritual searching, what I've learned about God comes down not to answers but to two questions applicable to everybody -- including me.
How do you know?
What are the chances?
I'll reprise the basic reason I now subscribe to a decidedly skeptical view of religious, supernatural, and other-worldly claims:
It is damned unlikely, and also egotistical, for anyone to believe they know the truth about some divine ultimate reality.
For this to be true, knowing the above-mentioned truth, two things have to be, well, TRUE.
First, there has to be a divine ultimate reality that can be known. I hope there is. I wish there were. But hopes and wishes aren't objectively real. Just subjectively real. It took me a long time to fully appreciate the difference.
My wife helped me with this.
I married her in 1990, a second marriage. Laurel had her own New Age'y beliefs. However, she was considerably less certain about them than I was about my Sant Mat beliefs, Radha Soami Satsang Beas version.
Laurel would keep asking me, "How do you know?" That God existed. That the guru was God in human form. That it was possible to know God through meditation.
I had answers. Of course I did.
Like everyone else I was prone to motivated reasoning. I'd embrace any scrap of information that supported my beliefs, including rumors, hearsay, tales in holy books, and such. Arguments and evidence challenging my beliefs were rejected smugly.
"Those skeptics haven't experienced divine truth. They haven't opened their consciousness to the wonders of ultimate reality. They are stuck in a mental prison of their own making."
Which naturally implied that I'd been able to grasp truths few other people on earth had. I was a chosen person! I'd been singled out by God and the guru to know divinity! Lucky me, poor you!
(If this sounds like what's taught by lots of other religions, no surprise; the pleasant fantasy of being a "chosen people" is common.)
I rarely thought, What are the chances?
This question is closely related to How do you know? Assuming there is indeed some sort of divine ultimate reality -- a big assumption, given the lack of demonstrable evidence -- a religious believer has to have stumbled upon a theological or spiritual belief system that, out of the thousands in the world, is the True One.
Or One's, perhaps. Several closely related religions could be so alike, they each know the truth about "God", viewed as divine ultimate reality, details unknown.
But all religions can't be true, since the differences are so large between them. How could God both be personal and deeply involved in the world, as Christianity says, and also an impersonal cosmic principle that operates automatically, as Taoism says?
(Note: Taoism arguably isn't a religion, but a philosophy; however it does have a religious aspect to it.)
Eventually it dawned on me that I was clinging to religious beliefs out of habit. And egotism. I really enjoyed feeling special, a chosen person, someone singled out for divine favor for reasons that didn't make sense, yet felt so good.
Now I realize that I don't know God exists. Further, I don't know anybody who does. More: if God does exist, I have no reason for believing that any of the world's religions understands the truth about God, or that I'd know if any religion actually did.
Not-knowing feels much more truthful and humbler to me.