You claim that the only way to truly serve God and bear fruit in this life is through what you’re calling the “New” way. Where do you find that in Scripture?
So, my brothers, you also died to the law through the body of Christ, that you might belong to another, to Him who was raised from the dead, in order that we might bear fruit to God.
But now, by dying to what once bound us, 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 7:5-6
For through the law I died to the law so that I might live for God.
Galatians 2:19