Health,
The פסוקים in דברים י״ג:ב-ד says “when a prophet comes in your midst and gives a sign and says let’s go worship other gods don’t listen to him because ה is testing you”
And rashi says “why did ה let the נביא make an אות, the reason is to test you”
And you say “But if their prophecy comes true – they are real.“
It seems like you’re failing the test