Theists, what do you think would be sufficient evidence to make you lose your belief?

If you could see an event that was as clear as water and obviously impossible without interference from God, but then saw conclusive evidence that it was actually technology from a more advanced alien race, would you lose faith?<br><br>I imagine most theists would not, because you could reason that that aliens are really angels or that those aliens themselves have a God and were created.<br><br>It seems, then, that there is nothing that can possibly change the minds of theists.<br><br>Or is there?