Christ is our source for the payment for sin, so to solve by substitution, as you learned in Algebra when you were 12 years old, “payment for our sins is the end (IOW reason)for obeying the law.”
Like it or not, that is what Paul is telling us.
1John 5:
[1] Whosoever believeth that Jesus is the Christ is born of God: and every one that loveth him that begat loveth him also that is begotten of him.
[2] By this we know that we love the children of God, when we love God, and keep his commandments.
[3] For this is the love of God, that we keep his commandments: and his commandments are not grievous.
Keep on picking and choosing which verses to believe; Yeshua plainly says in Matthew 7:23 that he will pick and choose which of those that claim to believe in him to be saved.
.
Hopefully one day you will leave and renounce that Rood cult.