Hi Diff, welcome to the forum

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Suppose I said I could prove to you that a particular God exists. If you say "2-frame cubinder" and clap your hands exactly n times, for some large n, he will appear and prove to you that he exists, and answer any questions you have about the "true" religion. Other people around you will be able to see him. If at any later time you starting doubting his existence, he'll reappear and confirm it for you. Furthermore, this test works for anyone in the world, not just yourself. You might think it's just a hallucination (brought on by too much clapping perhaps?). In this case, whatever you think will happen at the end of the world could just as easily be a hallucination.
The fact that I can describe this scenario proves that there exists a scientific experiment that could potentially prove God's existence. I present a hypothesis, you test it and if God appears in front of you then that proves he's real. The experiment is verifiable and repeatable. Obviously the experiment doesn't work the other way round; if he doesn't appear you haven't proven he doesn't exist. Anyway the point of this is that theism/atheism can be a scientific question. It does have a right answer, we may not know for certain, but that doesn't mean it's impossible to know, and it doesn't mean we can't put forward arguments in favour of one or the other. It certainly doesn't mean we should accept every possible view as equal.