So my answer would be Europe hasn't spawned a major religion like Christianity, Buddhism or Islam because it isn't a cradle of civilisation and hasn't delivered a wad of stories and behaviours for the future to misinterpret as a telegram from God.
I would say religions are complex social constructs, with associated stories, texts and performtive elements. I think many forms of Communism behave like a religion, aside from the minor detail of generally professing Atheism. They offers explanantions of the world, modes of behaviour, and followers often seem to experience the fervour that conventional religions seem to exploit so
effectively. So can we count France/western Europe as having spawned an "anti-religion"?
I'd also note, Wiccan noncsense aside, European folk beliefs like cursing, "black magic", sexual magic and fertility magic (which were surely part of pre-Christian faiths like the Gallic and Teutonic mythoi) might also count as an anti-religion and shadow relgion as they have persisted alongside a dominant Christian faith that denies and suppressed them-often attributed to the Devil.
My third European anti-religion contender would be Western Libreral thought and the Scientific Method. Science has a priesthood (men in white coats), famous texts and sayings (E=MC2, right?), heretics (Tesla), Saints (Marie Curie) and popes (Edison).
Judaism is influenced by many surrounding religious traditions, likewise Islam and Christianity. Buddhism has been transformed (mangled?) too in its peregrinations: I doubt Gautama would recognise what the Dalai Lama says and does as his own teaching. I would say Judaism and Christianity have been heavily influenced by their journey through Europe.