Such a presumption, were science to make it, certainly would taint. But science makes no such presumption.
Evolution does indeed make such a presumption, it attempts to answer the question of God's existence in the negative. Its most vociferous adherents: Hawkings, Gould, Haeckel are/were atheists. It denies God's word, it denies God's hand in the world. Of course it has absolutely no proof of such a thing and of course, since it tries to answer a question which is totally unanswerable by science, it is not science but charlatinism.