The effect of what are currently called electrons are physically measurable and difficult to explain by other means but if a more compelling explanation for those effects were to be found it would probably in time replace the currently accepted scientific model.
The effects of any God or spiritual philosophy are only subjectively measurable and most religions would too bound by dogma to change without schism a major tenet of that religion.
Every unidentified flying object is a UFO so they definitely exist.
It only becomes an issue when the irrational beliefs of someone impact on the freedoms of others.
By irrational I mean beyond reason, that doesn't necessarily mean something bad or barmy, just beyond the requirement of explanation based on evidence.
If you are to limit the freedoms of others based on a set of ideas they have to at the very least be rational ideas. It's very difficult to rationalise human slavery over paying a working wage. It's difficult to rationalise prejudice or torture.
It's easy to point to a book and claim an invisible being or an historical leader of a despotic group from anywhere in the world requires slavery or murder etc.
It bears mentioning not all religions have a godhead and not every theist is religious and not all irrational beliefs are religious or theistic.
I personally can't even call myself agnostic because it implies a fixed model of god or gods to be unsure about but I can know I'm not a Biblical literalist because I know how the bible came to be in it's current form and it's unbelievable to me that anyone would believe it, Let alone use it as a basis to prejudge others. I am clearly not a Mormon but I'm also not an Atheist.
However I can see how being a Mormon and acknowledging the high probability of electrons existing are possibly compatible situations.