And outright rejecting Old Testament... let's say not that many people will agree that you are a Christian after that.
Eh... huge swaths of protestantism does that to varying degrees, at a minimum? There's actually a lot (like, probably multiple hundreds of millions) of people that call themselves christian that reject some or all of the old testament's laws and strictures, and other parts of it to varying degrees as well.* Something something new covenant something.
Can't even say I blame 'em, with all due respect to judaism the old testament is incredibly fucked up on a
lot of levels. Yeeting those writings (get rid of revelations while you're at it, it'll do you good) from your metaphysics drops a ton of really nasty baggage.
* ... not necessarily
consistently, mind, but if you're expecting consistency from christianity (or any religion, for that matter) you haven't been paying attention, heh.