He didn't "teach Bible study." That lie was pushed by Leftist The Daily Beast (of course)-- and they took it off their website (your own link's source dos not have it-- whoops).   He was a bigoted Atheist who attacked and demeaned Christians online, as corroborated by first-hand those who actually knew him.
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Your "ease of obtaining guns" statement is hilarious: this monster was DENIED a gun license in Texas, was not allowed to own one for being a convicted wife/child abuser, and lied numerous times to pass a background check: where is the "ease" you're talking about, again?
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People only own guns "because they want to look bigger?" "The NRA owns politicians?" Please- come back when you actually have experience on firearms and our rights.