There’s no such thing as “Biblical Christianity.” The word Christianity is not even in the Bible, not once.
Check your sources.
Acts 11:25-30
J.B. Phillips New Testament
Believers are called “Christians” for the first time
25-26 Then Barnabas went to Tarsus to find Saul. When he found him he brought him up to Antioch. Then for a whole year they met together with the Church and taught a large crowd. It was in Antioch that the disciples were first given the name of “Christians”.
“There’s no such thing as “Biblical Christianity.” The word Christianity is not even in the Bible, not once.”
No such thing? In your world, perhaps. But Christianity pertains to Christians and Biblical pertains to the Bible... both of which do, indeed, exist. Your claim is in error.
A true bible scholar