Hi Dandy Dan.
Thanks for holding up the theist end, otherwise we'd have no one to talk to!
You seem to be thinking of 'scientific evidence' as meaning something that has to be taken apart in the lab and expressed in molecular terms. I think it is wider than that. There are different ways of understanding natural systems, at the appropriate level - they are not 'different ways of knowing' though but compatible explanations at different scales - sub atomic physics is the basis for understanding chemistry, chemistry is the basis for understanding DNA, proteins etc..., understanding how these chemicals interact helps to make sense of genetics, genetics helps to make sense of the biology of organisms, biology helps to understand behavior and culture, studying behavior and culture help to understand politics and history etc..
It's not that everything can be reduced down to atomic or biological explanations but that if the high level explanation contradicts what we think is going on at a more basic level then one or other of them is wrong.
So yes there is a scientific understanding of love (hormones, nerves and such like) but there are also reasonable reasons to think that
someone loves you - are they alive, do they know you, how do they act towards you. I would say you don't really take you husbands love on irrational faith, but if you are convinced that George Clooney loves you then you are taking that on irrational faith (unless of course that is who you are married to in RL
)
art, music etc... are made by physical beings bound by laws of nature. It doesn't mean that you can't understand them at a higher level, but it doesn't involve magic.
The impossible things I am talking about are the things that if true would mean we would have to revise scientific understanding of the world - virgin birth, resurrection, transubstantiation, angels, souls, winged horses, communication through burning bushes etc... If any of this stuff actually happened, then everything we think we know about how the world works, through scientific investigation and rational thought is wrong.