"That's precisely what it does require."
Check a dictioinary, orthodoxy is not required, only an acceptance of Christ as the Savior.
As for the 'other gospel' thing, we consider orthodox Christianity to be another gospel that evolved into existance after the apostolic age. We believe that apostacy is what requried a restoration of the fulness of the original gospel though a prophet. Time will show who is right and I'm content to leave it at that.
As I said before, according to the dictionary, one does not even to profess Christ as Savior to meet the dictionary definition of a Christian.
According to Merriam-Webster, a Christian is simply one who "professes belief in the teachings of Jesus Christ" and according to the OED a Christian is "one believing, professing or belonging to the religion of Christ."
That's far vaguer than your definition.
Fortunately for those who care about precision in such matters, the Church has given an authoritative definition.
As for the 'other gospel' thing, we consider orthodox Christianity to be another gospel that evolved into existance after the apostolic age.
Fascinating theory, but not grounded in historical fact.
We believe that apostacy is what requried a restoration of the fulness of the original gospel though a prophet.
Unfortunately, the Gospels teach that there will be no completed apostasy, but that the gates of Hell shall never prevail against the Church. And the Scriptures also tell us that there will be no new Gospel or teaching of any kind.
Time will show who is right and I'm content to leave it at that.
The facts of history already disclose who is right, and time will serve only to confirm the consequences of those facts - not their already manifest reality.