most major denominations of Christianity do not allow for salvation for any other. There are 40,000 denominations (slightly less). It’s highly unlikely yours is the right one.

Idk, bro. I'm Catholic by confirmation, Jewish by birth, and I accepted into my soul the blessed light of Islam one time in college. Pretty sure I've got the main bases covered.

The Holy See recognizes the Orthodoxies, but not Protestants.

The Holy See recognizes the Bishopry of the Orthodoxies (and the Anglicans). They dispute the ministry of Protestants, not the membership.