Christianity is not Judaism on steroids.
Judaism is archaic.
Judaism was superceded by Christianity.
Those who combine Judaism and Christianity have neither.
The Old Coveneant was only with Jews.
Gentiles were never under the Old Covenant.
The Old Covenant is dead and should have passed away in the 1st century except for Jews in the church who would not accept the deity of Jesus Christ.
They forced the issue of God the Father and God the Son, when in fact, the Son is the express image of His Holy Spirit Father.
The trinitarian error came out of compromise and is the reason for the weakness in the church.
When we turn back to Christ Jesus as Mighty God and receive His Holy Spirit we will manifest as Sons of God to the healing of the world.