The American colonialists were rabid Protestants. Any attempt to annex them would guarantee a rebellion and France would be facing both them and the British. It is ASB.
No it's not. It's really not. ASB would involve something so astronomically impossible that it would require Alien Space Bats to let it happen. Examples of ASB would include:
What if Cotton Mather Became the Incredible Hulk
What if John Winthrop Uncovered the Holy Grail in the New World.
What if China Conquered the American Colonies
What if the Puritans tames Wooly Mammoth and used them as a food source.
What if Maine broke away to form the Mainian Empire, reinstituted the cult of Isis as their main religion, and conquered Europe.
Those are so impossible, that intervention from Alien Space Bats is the only way to make it happen. (Though I WOULD love a TL where poor Cotton Mather hulks out after a crowd besieges his home for promoting small pox innoculation.)
What you are referring too, is something which is
unlikely. And yet, even there, how unlikely is it? Britain conquered New France and incorporated a deeply Catholic population into an Empire which was largely anti-Catholic and yet, after granting freedom of worship, there were no major rebellions. Weird.
I would agree that the Puritans were more anti-Catholic than the Canadians were anti-Protestant. But: so what?
The original post posited a scenario where the American colonies rebel against France. Its highly highly unlikely that the French would try to absorb 1.5 million English colonists (but NOT ASB: no deus es machina is invovled. Just really bad decision making). So I gave a situation that the French might believe they could absorb the population but it would likely lead to rebellion.
Please stop over using "ASB." Too many people use it as a way to shut down conversation and to try to buttress (poorly) their own worldview, because they can't conceive of things turning out a different way.
I'm not accusing you of the latter, but it is a particularly nasty trend upon a board which is set up to discuss alternative History. And when "ASB" gets thrown out to dismiss situations which clearly are NOT ASB, it cheapens the phrase.
Anyway, sorry, i shall bow gracefully step down from my soapbox. I hope I did not just come off as rude, and if I did so, i apologize.