God is Pro-Life
Now, I realize that I tend to find this sort of thing more obnoxious than a lot of people do. I'm a compulsive reader; if you put text in front of me, I will read it. Even if it's just the ingredients on a cereal box, I will read it. So this affects me in much the same way that someone going around shouting the slogan over and over would affect most people: I may agree or disagree, but it becomes obnoxious just because it's hard to ignore.
I actually thought this one was kind of cute. After all, G-d is supposed to have called forth "grass, and herb yielding seed after his kind, and the tree yielding fruit, whose seed was in itself", "great whales, and every living creature that moveth, which the waters brought forth abundantly, after their kind, and every winged fowl after his kind", "the living creature after his kind, cattle, and creeping thing, and beast of the earth after his kind"; and, of course, G-d is supposed to have created man. So, yes, you could probably call anyone who created all those living things "Pro-Life".
Of course, G-d is also supposed to have given his creation Free Will (at least in some interpretations - I'm going with the way I was taught**), so he could be considered "Pro-Choice" by much the same logic.
And, since G-d is also supposed to have created the heavens - and since space consists mainly of a lot of... well... empty space - G-d is also clearly "Pro-Void".
None of which has anything to do with the current socio-political argument. Still, as an interesting little bit of conflation, it's fairly clever.
The alternative reading of the sticker - "God Supports My Political Opinion" - is rather less clever, and probably constitutes taking His name in vain.
To quote Anne Lamott, "You can safely assume that you've created God in your own image when it turns out that God hates all the same people you do."
* I think the actual brand is "Navigator," but I prefer the malapropism.