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Coming from a very religious background, and having struggled with this personally in the past, the reason is usually twofold:

1. A genuine ignorance concerning what we know about evolution.

2. An unimaginative perspective in regards to evolution, preventing such people from getting past any of the perceived "holes" in current evolutionary theory (ie, the specifics behind the evolution of bisexual reproduction), causing them to denounce the theory as a whole.

A person with no biases initial regards to evolution would generally have an opinion like, "Well, we have ample evidence for evolution in general, and while I have yet to see a proper explanation for X, one probably exists, and maybe it's *spur of the moment, amateur theory*." On the other hand, a person with ideological reasons to not believe in evolution (Creationists, etc.) will go, "Ok, you have evidence for A, B, and C, but what about for X, huh? Evolution can't work without that!"

I've made a slow journey from an evolution-skeptic Catholic to an evolution embracing atheist over the past two years, and I'm still part of a family that disagrees with me quite strongly on many of these issues. I have much experience with these types of people.