It WOULD be funny, but people already see anyone with a religious point of view as being pushy and overbearing.
I'm sure that the billboard is meant to offend. Protestations to the contrary are summarily disregarded.
I am also sure that the 'Right to Life' placards waved by abortion protesters at passing cars with gory photos of aborted fetuses is meant to offend too - and I'm anti-abortion myself (but I completely disagree with those methods).
And the 'Gay Pride' parades that involve not just gay pride, but gay public exhibition of sex, not really making me sympathetic to the cause.
They don't do much for me; don't really offend or infuriate me either. I just stop being interested at all. It's like "yawn. great. fascinating. go away now please."
That whole 'in your face' thing is a bit mystifying to me; are they really trying to persuade anyone with that shtick?