OP
The thing is: none of the religious books on Earth is actually true. They're just books written by humans. But that doesn't mean they're worthless. If they inspire people to have a faith in the divine and be good people - fine. The different religious traditions have developed from different cultures, so it's not the same everywhere. Christians have their views, muslims have their views, hindus have their views - that's all ok, but none of that is "the truth". The real divine, that is beyond words, doesn't care what names humans give to it. They can call it Allah or Brahman, or however they like. Religions are a human thing in the human world. Angels have no religion, they're not christian or muslim or hindu angels. They're just the beings of light in the cosmos.
For humans to go on a spiritual journey doesn't necessarily require a religion. If they can do it without, find the light by themselves - great. But most can't do that. Most humans need guidance, doctrine, spiritual teachers and leaders. So religion is a tool for spirituality, a way to find the light. It would just be good if humans would understand that one tool is not better or inferior to the others. Fighting about who has the "true" belief is so childish, and prevents real spirituality from happening.