Does anybody need a:
of what a true or biblical Christian is?
Among many places you will find one of the best definitions, descriptions, distinctions, and digest of what a real biblical Christian in Romans 6:18.
"And having been set free from sin, you became slaves of righteousness." (Romans 6:18, NKJV)
This verse is a fundamental conclusion about what a Christian person is.
A Christian has been - past tense - freed [by his/her death in Christ] once and for all, and has been made a slave of righteousness.
A true biblical Christian was once a slave to sin but is now been made to be a slave to righteousness.
A transfer of ownership has taken place. A transfer of dominance has taken place. A Christian is no longer under the master and dominance of sin, but is now under the master and dominance of righteousness.
Anything less or anything different, is not a Christian. That is right, you cannot claim to be a disciple of Christ and live under the mastery and dominance of sin.