Science is about finding ever better approximations rather than pretending you have already found ultimate truth.
A casual stroll through the lunatic asylum shows that faith does not prove anything.
Every person, as every institution, and, above all, every religion is to be judged not by the amount of atrocities or the wrong committed but by the right conduct.
The world is touched by sacrifice. It does not then discriminate about the merits of a cause. No so God - He is all seeing. He insists on the purity of the cause and on adequate sacrifice thereof.