Under this view, Christianity is not a form of doctrine objectively revealed in Scriptures. It is not knowledge or a systematic exhibition of what the Bible teaches. It is the interpretation of this inner life. It is based not upon truth but upon feeling, not upon testimony but upon emotion. When our brothers tell us that there is a core gospel that all must believe, and the rest is peripheral and not essential, that we need to have an encounter with God - an intimate confrontation with deity, that we need to give personal testimony of the presence of God in our own life apart from the biblical text, that our heartthrobs are sure evidence of our justification with God, they are teaching Protestant tradition.
Bible tradition is to accept and follow the whole revelation.
One part of God's Word is not more important than another part of his Word. A man gathering sticks on the Sabbath was executed. Ananias and his wife Sapphira gave up the ghost for lying to the Holy Spirit. The crime of Laodicea was being neither hot nor cold, and Jesus threatened to spew them out of his mouth. We have no right to pronounce some part of Bible tradition as important and necessary and the rest of it as barren and useless.