So do you have to believe in the Trinity to be a Christian?
“So do you have to believe in the Trinity to be a Christian?”
Not to butt in, but St. Paul stated in the Roman quote above that’s just not our business. The decision on who is a “Christian” is between each individual person and God (or, more particularly, Christ).
Is there are better answer to your question? IMHO, sure, and I bet we agree, but I (and you) are not going to be the judge -— Jesus the Christ is the judge and the Holy Spirit speaking through St. Paul told us to butt out.
Not being an apostle apointed by God, I do what I am told.