Hey Spud-nik,
I'm an atheist; welcome to the frying pan!
Here's something you might find is an easy way to increase the burden of doubt in your mind - watch a few season's worth of Animal Planet's "MONSTERS INSIDE ME". They are up to season 5, I think. In short, it is a layman's course in the subject of PARASITISM, which is Nature's Way of saying, "Fuck you and your imaginary friend!"
You may want to keep a puke bucket close at hand while you watch, unless you've got a really strong stomach, in which case you can let the puke bucket sit six feet away.
Here's a link: http://www.animalplanet.com/tv-shows/monsters-inside-me/
Share the shows with your wife. Ask probing questions like, "How do these things fit in with god's glorious plan?" "What purpose would such vile creatures serve in Paradise?" "Should we not care that other creatures suffer and die with parasites, even if we humans were spared?"
Share your puke bucket with her, demonstrate the divine quality of empathy.