All spiritual or religious beliefs have no basis, that's literally what differentiates them from facts. They're all ultimately grounded in baseless assertions.
> All spiritual or religious beliefs have no basis
Spiritual and religious people give reasons and justifications for their beliefs all the time. Have you never heard an argument for why the universe couldn't exist without a god? Surely you're aware of all the arguments made in things like the philosophy of religion?
Even if a belief feels to you to have no basis that doesn't mean there isn't one. People often claim that their intuition about something has no basis, but it's actually that they don't have a consciously-accessible basis -- there's all the actual things they subconsciously picked up about, say, the person who seemed shifty, and all the subconscious mental processing that leads to that feeling.
Yes, and this shows you agree with my point. I think what's confusing you is that you're thinking "has a basis" means "is factually correct". If you look at my comments in this sub-thread, you'll see that I'm talking about the basis of views that are potentially/actually wrong (e.g. the view that there's a market for small phones, or the view that the earth is flat). This "basis" is the reasons, drawn from experience or other information, why we think something is the case. That basis can be dead wrong, but that doesn't mean it's non-existent.
If I believe it is true that the world is flat then someone may reasonable ask what the basis is for that belief.
Give me an example of a belief with no basis at all.