Why is it in vogue in scientific circles to argue in favor of multiple dimensions...?

It seems more likely than us having a spooky effect on the quanum level by observing things.

It's a theory, not a " vogue" .

In everyday language, the word theory is often used to mean a hunch with little evidential support. Scientific theories, on the other hand, are broad explanations for a wide range of phenomena. They are concise (i.e., generally don't have a long list of exceptions and special rules), coherent, systematic, and can be used to make predictions about many different sorts of situations. A theory is most acceptable to the scientific community when it is strongly supported by many different lines of evidence

its not in vogue, its quantum mechanics. It is one of many models to explain apparent flaws in the calculations of objects, gravity, etc. While its most popular and has made many many good predictions to date, its not perfect.

See in science ,we don't believe in absolutes. Science must be Falsifiable. That means there must be a situation where it would prove that your idea was totally wrong. Its not a scientific theory if it doesnt.

There are situations which would very much falsify the idea of extraspatial dimenisons. Now you tell me how to make heaven Falsifiable. What would it take for it to indisputably prove that supernatural realms do not and cannot exist?

Right, you don't have one. That is why it is not credible. It breaks the rules of the scientific method.

Deal with it.

Multiple dimension theories exist as explanations for measurable phenomena. Basically, there's evidence, and that's one of the possible reasons for it (this is all quantum theory, it's the most complicated thing in the world). Supernatural phenomena, on the other hand, are ghosts and god and all that stuff, and there's no evidence for it whatsoever. A breeze slamming a cupboard in your house or a feeling you have that god must be real are not evidence of anything.

it's still theoretical and more philosophy than science,

but that's what happens when you don't know something and are still studying it.

whether you want to misuse the word "supernatural" or not is not really important,

but supernatural means out of the realm of natural processes,

and if there are dimensions or other realms,

then that would be natural, and by definition, not super natural.

That's the way science works. Someone puts out a theory that sounds perfectly reasonable, and fits what we already know, then others debate it, search for possible proofs, edit and refine the theory and eventually come up with the truth. They are doing what could be called "vetting" the idea.

Because there's evidence support the scientific concept of multiple dimensions, and no evidence it has anything to do with the fairy tale realms.

The mathematics show multiple dimensions, the math doesn't work other wise. There is no math that can show a god in any manner.

Whichever way you try to bend it, there is absolutely no such thing as a supreme being/god/deity or whatever you want to call it.

None, full stop

Another realm implies that it is accessible by humans, and that it's completely freestanding from our fourdimentional world. This is not the case.