>> “To claim that no one other than those of the lost tribes of Israel will be saved is utterly preposterous.” <<
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Must you always twist the message?
It begins in the prophets of the OT. The bride is the House of Israel, and those that sojourn among her.
The House of Israel at this point in time is probably in excess of four billion people. Out of them he has a “remnant” that he will save.
What is preposterous is your constant claim that Yeshua’s words are not what he meant.
Salvation is offered to them that come to him, and none come to him except the Father draws them to his son.
So far it looks like you have not yet come to him for some reason; you keep denying his requests to obey his Father’s commandments.
Remember: Few there be that find his gate.
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The church is the bride of Christ. Israel is the wife of the Father.