I agree, the cross does seem an ironic choice of symbols.
I seem to recall something in the Bible about graven images. In other words, the manufacture of a religious symbol, or idol in the case of the golden calf, was percieved as sin. I know this is Old Testament, but I’d wager that a cross might count as a graven image to some.
“I’m sorry Mr. Wiseman. . .it never occurred to us to stick a rocket up your ass.”
-Theo “Now and Again”