So that's just one thing right there. If you'd like, I can rattle off a whole list of not-very-nice things in the bible that can be interpereted any way you want them to be. The fact is that for every good thing in the bible, there's at least one bad thing, and usually more. What the WBC is doing is exactly what every other Christian in the world does: picking out the parts of their religion that they like while ignoring the parts they don't.
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Just because their interpretation is different from yours doesn't mean they aren't Christian.