and just look at the picture; the message is: No man can equal GOD! and Jesus is from God!
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And that is NOT what I see at all. My first response is a reference to the LDS doctrine that Mary was one of God’s wives and that God had sex with Mary to conceive Jesus.
Now, granted, my perspective is different than most Christians (having been Mormon before I became a Christian), but nevertheless I found it offensive at first glance.
I think you've hit the nail squarely on the head: People see in billboard what they are PREDISPOSED to see!
I myself, who hadn't read the accompanying article very well, saw it as humorous; a joke about Joseph having a inferiority complex; and perhaps a dig at the Romans’ “ever-Virgin” doctrine—but NOT insulting to either of the two saints or Christ.