The early scientists credited God because A. the church would have LITTERALLY killed them in some cases if they did not. B. They did not have a full understanding of all factors involved. All spiritual belief is rooted in a desire to explain the unexplainable. Early man credited the gods with creating lightning, because they did not understand it. As we grow as a species there is less and less (linearly, not relatively) that we do not understand, so we credit God with less and less in terms of how it works.
I believe in the loop quantum gravity hypothesis, as a fundamental theory. It is unproven, and will likely be decades before we can definitively disprove it, or its rival hypotheses. However I believe it because given the evidence, it makes the most sense to me. But I do not treat it as fact, because it is not. In the same way that I believe there is a God, and he is (for the most part) the God described in the Bible, I do not treat it as fact, because it is unproven, and in fact, unprovable, and also not Science. (anything not testably disprovable, is not science).
Those people you described. They are one of over 10 BILLION people that have lived in the world. Are you familiar with the laws of statistics? Cases like that are bound to happen. Just because I pray to God before I take a test does not mean that Gods direct action causes me to do well on the test.