Christianity is not merely a matter of personal interpretation of bible doctrines. Christ commands that we know Him as opposed to false teachers.
Christ warned us about being deceived, and Paul proclaimed that people believing in a false gospel were cursed. At the same time, we need only to understand the bare essentials of bible teachings to avoid deception.
These teachings are the ones necessary to come to genuine faith in Christ: (a) Jesus is the Son of God foretold in the Old Testament, (b) Salvation is by faith alone in the Son of God, (c) Jesus died for our sins and was resurrected for our justification, (d) Christ is coming again to receive us into the heavenly kingdom.
A person does not need to be an automobile mechanic to know how to turn the key to an ignition and drive a car. In the same way, a person does not need to be a theologian to know how to read the Bible. However, if a person does not know the basics about how to drive a car then it would be unsafe for them to drive under any circumstances.
Being a Christian requires basic knowledge about God, the Bible, and Jesus Christ.