Faith is the acceptance or assumption of something for which there is no direct evidence of. Both scientists and laymen do this in order to explain things that they do have direct evidence of. The multiverse is a good example of this. There's no direct evidence of the multiverse, but it's existence is taken on faith in order to explain what we can observe in our universe. Same for God.
The theoretical multiverse is an example of scientists not being scientists, but rather hypothetical thinkers.
To graduate the idea to a science they would have to make some testable predictions that we could tell the difference between an affirmation that there is a multiverse and the state of affairs where there isn't.
Then they would need to conduct some tests to actually test the predictions out to see if the idea of a multiverse actually predicts what will happen under controlled conditions.
Reasonable faith is never blind, it always has a reason and that reason is almost always to search for an explanation of what we experience/observe in this reality.
Explanations are things that help you make predictions about the future based upon your knowledge of the present.
If the future has to be "explained away" then you don't have an explanation.
In reality faith is how people hand wave their ignorance without explaining much of anything.
How "reasonable" this is is quite debatable.
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