The idea of testing spiritual things that are not even part of this physical realm is rather ludicrous...because the tests can only be done IN this physical realm.

It would be akin to trying to test anything else that can't materially be pinned down....you cannot test something that is not possible to grasp or manipulate with any of the tools at hand.

For instance, scientists have hypothesized that there may be other dimensions of reality beyond the ones we are presently familiar with. And there may be. But how are we to test them if we can't GO there???? ;-) And if we did go there...we wouldn't be here any more. So no one would hear about it from us, would they?

If there are spiritual worlds, then the problem would be the same. If you can't go there physically then you can't test it, can you?

Look, I can go anywhere I want to in my mind, right? I can do that right now. And my thoughts are real...they're a real inner experience that I'm having in my mind....but they're not physical. You can't test them. You don't know what they are. They're forever invisible to you. That doesn't mean I am not thinking them, it just means that you can't do anything about it.

If there are spiritual realities in what amount to other dimensions of reality...and there may be...then you can't do anything about them either.

Religions generally assert that there are such realities...and there may be. If there were....you still would not be able to test them.

The fact you can't test something or sense it doesn't necessarily mean it doesn't exist...it might exist. And you don't know, do you? But you'd sure like to imagine that you do...right? Well, that's an idea you like holding in your mind because it makes you feel in charge or something, but it's no arbiter of anyone else's reality.