Situation:
Believer thinks that an improbable event that actually took place (e.g. surviving of bullet in head) did so because God intervened. But they cannot know what would have happened otherwise (hence they also can't know if God intervened at all). Same thing is true for their prayers: If an event prayed for does happen, they cannot say "my prayer worked" without implying that they know what would have happened otherwise.
They just cannot know what would have happened otherwise. Same thing for throwing a coin: Even if you know that the probability is 50/50, so 100,000 coin throws will result in about 50,000 heads and 50,000 tails, you can not - really under no circumstances at all - predict with certainty the outcome of the next throw. (Side note: Which I find to be a mind-boggling property of reality.)
Now, imagine that there would be a hypothetical Savior coming to Earth one day. Second Coming of Jesus, arrival of the true God, whatever. Something.
Would this Savior effect that everything becomes perfect? Would God purify the world? Yes he would. Or if he takes people to heaven, doesn't matter.
What I am going for here is this: Would this Savior effect that people lose their misconceptions? Would he show people truth versus fantasy? Would he bring sanity to every single mind?
Yes, he would. This should be accepted by a religious believer.
So, to close the circle: If the believer who can not know how the outcome of the situation would have been without God's intervention just want to believe it for the purpose of feel-good and what have you - does this believer then not work in direct opposition to the Savior?