Even if you somehow managed to successfully interfere with history to prevent the advent of Christianity, you'll return to the present to find that one of the other religions has taken its place and had much the same effect, or more likely that a new one exists instead that has all the same features that allowed Christianity to endure this long. This other religion will probably revolve around an individual who appeared in the world on occasions decades, centuries and millenia apart (without having aged) who committed bizarre and inscrutable deeds with some sense of purpose before disappearing again, and its believers await his inevitable return.
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