Hebrews 11:6
But without faith it is impossible to please him: for he that cometh to God must believe that he is, and that he is a rewarder of them that diligently seek him.
You do not have faith in a vague blob, and abstract principle. God showed you what He was like (at least a glimpse of Himself) in Scripture. If you reject that, you worship a different God altogether.
Your comparison to eating grain on Sabbath, as all things Jesus 'contradicted' the Law was always explained as a true interpretation of the Law, not its violation. The Lord never advocated changing the Law, dropping the Law, etc. Circumcision is equivalent to Christian baptism. The Lord never advocated baptism be substituted for circumcision.
The Lord came to fulfill the Law, not to break it. And He said that nothing will ever be taken away from it until the end of times.
for he that cometh to God must believe that he is, and that he is a rewarder of them that diligently seek him.
That's right Blogger. And where is the untampered rule book on that?