Eh, I find that not very convincing, especially when distinct religious groups like the Ethiopian Jews and other such groups exist that have very little other than religion in common with the dominant group that is commonly referred to as Jews.

Confusing Jewishness and Judaism with culture and ethnicity is IMHO a tactic that Zionists (and funnily enough also antisemites) use to push their agenda and it usually comes with discrimination of other Jews like for example those from Ethiopia.

And most Christians in Europe are also not very religious.