My father was Jewish. A few years back, he "found Jesus" and became a Pentacostal Christian. He says he has a personal relationship with God and talks to him. It has really made him a better person- all the anger issues he had have disappeared, and though I know his beliefs aren't for me, I'm happy for him.
My girlfriend was raised Christian, but felt it wasn't right for her. She had a strong experience with spiritual possession, and now is following a Druidic kind of path. She has become more confident and assertive as a result.
These might both be psychotic delusions, or hallucinations, or contact with the one God (Judeo-Christian), or the Goddess, or a transcendent power that shares all names, or an alien telepath. But what CAN'T be denied is this: those experiences had a profound life-changing impact on those two people. Can I say that one is wrong while the other is right?
We can discuss and debate what might have happened in the mental or spiritual realms. What can NOT be argued is that these events created a positive change in the physical world! Whatever the belief, "Believing is being." It's the changes created in the world that make a thing true. If you have a spiritual experience and you act on it, what matters more: where it came from, or how you act on it?
I think what's true are the things we make real based on what we believe. If we act positively on a belief, we have made things better, and I can't fault that belief just because it doesn't inspire me the same way.