If I drink my home-percolated Costco coffee in a Starbucks cup, that makes it Starbucks coffee, I’ve decided.
It’s a good decision. I’ll enjoy it much more now, and it’ll certainly be a lot cheaper than going to Starbucks.
He is a Jew who is inwardly, Paul says in Rom. 2:29. By extension, a Christian is one is inwardly, not one who “dresses” the part, though it be a lot cheaper.