No, There is only one gospel of Jesus Christ for those living today!
Are you not aware the old testament is just that? An old testament.
We today follow and are under subjection to Jesus' gospel, His new testament.
Your doctrine has two new testaments. There is only one new covenant, one new testament, one will, one law of Christ. Jesus' gospel. Hebrews 9:16-17.
Matthew 5:17
Think not that I come to destroy the law of Moses, or the prophets: I am not come to destroy, but to fulfill.
Galatians 3:24-26
Wherefore the law of Moses was our schoolmaster to bring us unto Christ, that we might be justified by faith(James 2:24)
But after that faith is come, we are no longer under a schoolmaster .
For we are all children of God BY FAITH IN JESUS CHRIST.
Romans 10:4
For Christ is the end of the law of Moses for righteousness to everyone that BELIEVETH.
Jesus' gospel is the only good news for all today.
Guojing, do you believe your faith doesn't save you?