theory
n.
a working hypothesis that is considered probable based on experimental evidence or factual or conceptual analysis and is accepted as a basis for experimentation
By that definition neither God nor Christianity are a "theory," as they are in no way based on Scientific evidence or experimentation.
As for the "if not for God, where did the Universe come from?" bit, many people seem to think that putting God into the equation seems to solve the whole Universal mystery, but where did God come from? Has he always been here? Did he just pop into existence? I guess whatever your answer to that question could be the same answer to "where did the Universe come from?" Either way, we're just guessing because it's one of those things that's impossible to know.
And I'm not really talking about the Big Bang theory here, because that explains how the Universe formed, but not where it came from... why there was a tiny point of infinitely dense mass that just decided to explode... that bit.
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