Your question, If I obey the Old Testament Law (Torah) today, am I pleasing God or the devil?
Where we keep the law or not is debated today just as it always been. But the debate was about where or not the law should be included as part of obtaining righteousness. Or should one keep it after one is saved by grace.
This is what Jesus said about those the keep and teach the law opposed to those neither teach them nor observe them.
Matthew 5:19 “Think not that I am come to destroy the law, or the prophets: I am not come to destroy, but to fulfil. For verily I say unto you, Till heaven and earth pass, one jot or one tittle shall in no wise pass from the law, till all be fulfilled. Whosoever therefore shall break one of these least commandments, and shall teach men so, he shall be called the least in the kingdom of heaven: but whosoever shall do and teach them, the same shall be called great in the kingdom of heaven.
If Jesus had said this, why do people argue about whether to keep the Law that has been given?
The law was never intended to lead a person to righteousness; only God’s grace can achieve that. The law provided us with the knowledge and understanding of sin. This is where the confusion arises. The law cannot be maintained without first receiving grace. It is grace that resides within our hearts that enables us to do so.
Listen to how the apostle explains it.
Galatians 2:21 “I do not frustrate the grace of God: for if righteousness come by the law, then Christ is dead in vain.
(See post for the rest)
