It's hard for us to see on this side of eternity, but God planned everything to occur when, where, and how it has transpired, including the birth of his Son in a barn.
Our desires are transformed by the Spirit, if we are in Christ. Sin and the Spirit cannot both remain.
Christ is the embodiment of true freedom. By submitting to Christ, we free ourselves from sin and death, but also from all worldly attachments/bondage.
Biblical Law serves many purposes; it shows our failures, our need for a redeemer, and even how to live in light of the Gospel. But it cannot save. Only he can.
God has provided one, clear path to salvation. There is one gospel, though many gospel pretenders.