There are basically two ways to serve God:
1. "The Old Way of the Written Code" (Human effort, good works, religious duty)
2. "The New Way of the Spirit" (Grace, faith, power of the Holy Spirit)
Paul, a very religious man, finally figured out he had spent his entire life serving God the old way, living by the written code. He then tried to explain his new revelation to the Romans. "We have been released from the law so that we serve in the NEW WAY OF THE SPIRIT, and not in the OLD WAY OF THE WRITTEN CODE." (Romans 7:6)
This is one of those either/or things, not a both/and thing. We can't do both. We can't live the old way and the new way at the same time. We either trust in God's grace or we trust in our works. We either trust in what God did for us or what we do for him. Either/or.
I know you are serving God, but are you doing it the old way or the new way?