[Lukongsimi]

Any who submits their will to the almighty God is a Muslim. That is the definition of a Muslim. Jesus explicitly said, according to the book of Gospels, that only Muslims will enter the kingdom of God, aka Paradise.

How did some of the known early Christians go extinct?

The whole book of bible how come no religion such as Muslim?

Only the word Christian is found
The word Christian is used three times in the New Testament: Acts 11:26, Acts 26:28, and 1 Peter 4:16. The original usage in all three New Testament verses reflects a derisive element in the term Christian to refer to followers of Christ who did not acknowledge the emperor of Rome.