I believe that if you believe Christ is the Son of God you are a Christian. I did not realize the slightly different meanings of the word among denominations. I can’t remember chapter and verse but the Bible said the different churches were for different people. Muslims believe that Christ will return and ask his father for forgiveness and break all the crosses. The think that Christ is a minor prophet and will fallow the Mahdi.
Are you certain nothing more is required?
I would point to ...
Luke 4:40 While the sun was setting, all those who had any who were sick with various diseases brought them to Him; and laying His hands on each one of them, He was healing them.
41 Demons also were coming out of many, shouting, "You are the Son of God!" But rebuking them, He would not allow them to speak, because they knew Him to be the Christ.