All nations are social constructs. Period. If you want to say that America's national identity is ideological rather than ethnic, fair enough. But that's equally true of France.

So since reactionaries here have no authentic tradition to fall back upon, they have nothing to help them to get it right at least some of the time.) We don't need to be in favor of secularism, since reality is secular.

Given that Europe managed to come up with some remarkably  nasty reactionaries appealing to 'authenticity' and 'tradition', based on the notion of a 'real' 'organic' society, as opposed to the constructs of modernity, I'm not sure this is a good argument. You should do some reading on proto-fascism. Fritz Stern's Politics of Cultural Despair is a classic.  But the literature is enormous.

On France and it's 'Christian rooted' secular values - ?! Actually based on a hatred of Catholicism.

Germany's anti-abortion stuff is simply the product of the dominant part[ies] being predominantly by Catholic - and the direct successor to a explicitly Catholic part[ies].