"Genuine" lol. Going to reignite the European wars of religion with that one. Catholicism is simply the result of the Bishop of Rome choosing to schism from the rest of Christianity, and members of Eastern Orthodox branches of Christianity might take issue with the declaration of Catholicism as being the fundamental European and Roman church, or as the primary force against Islam (as if that's something to necessarily be proud of - Christianity has aggressed against Islam as often as Islam has aggressed against Christianity). Islam has been a religion of conquest, but Christianity has been the religion of forced conversion in Europe.
Anyway, if Mister totally-not-racist Identarian really want to promote the European identity, he or she should be pushing irreligion, and not Christianity. Europeans are by and large not religious, and have becoming more secular over time.
No, what this identity stuff is really about is ethnic imperalism, and laying the groundwork for a future campaign of ethnic cleansing and genocide. That really needs to be said. This is a campaign to oppress innocent for reasons that are bigoted and arbitrary, and if it appears otherwise, it is just due to the standard sort of entryist tactics normally employed by these fascist types.
RE: What is Identitarianism?