AAQ, I never said that the Beta Israel, ( I never heard of the term Judaic Beta Israel…) didn’t come first to Israel. In fact, I said the opposite, the Mura Falash decided that they were Jewish AFTER the Beta Israel migrated to Israel. The Falash ARE practicing Christians.
As for Russian immigrants in Israel, there are hundreds of thousands who are not even Jewish, never mind not religious. No one claimed that they are practicing Christians as the majority of Russians became secular under communism so most are not practicing Christians. But a very big percentage of Russians are non-Jews. They are creating a spiritual churban in Israel right now.