Your simple understanding is all that is needed. Do not fret about what others may think. The real meat of being a Christian comes from obeying the word of God as found in the New Testament.
The real meat of being a Christian comes from obeying the word of God as found in the New Testament. But you don't obey His word. You sin all the time. Jesus died for your lack of obedience. You are disobedient. If you don't realize this, you are a Pharisee. You are forgiven all your disobedience through Christ's life, death and resurrection.