Let me put it this way....
If you walked into a mosque and demanded that everyone there refer to you as a muslim, what do you think their response will be?
They may ask you if you believe Muhammed is a prophet.
They may ask you if you believe in their specific doctrine concerning Allah.
They may ask you if consider the Koran to be scripture.
If you answere “no” to those questions - you can call yourself a muslim all you want - they will never accept you as one.
There are people who call themselves “mormon” who the LDS refuses to recognize as such. I am sure you have your reasons.
Christians will never refer to someone as “christian” when they see the definition of “God” is much different, and the definition of “Jesus” is much different.
It just isn’t going to happen.
It isn’t personal - it’s that way with any group that messes with the doctrines of Christ and the trinity.
No. Let’s redescribe it. How would YOU feel if someone claimed that YOU were not Christian when YOU personally believed that Christ was your Savior, the Redeemer of Israel, the Promised Messiah, and the Only Begotten Son of God. That Christ has paid for the sins of the entire earth?
If you DIDN’T believe in Christ, who cares if someone claims you aren’t Christian. But BECAUSE you believe in Christ, it’s extremely offensive that someone denigrates your belief.
I don’t tear down your faith, and claim that your belief in Christ is false. So why tear down mine?