To my mind, the key phrase in that scripture is “my law.” Are the church’s rules the same thing as God’s law? How many of the church’s rules do you have to follow to get into heaven? Are there any rules that are not requirements for getting into heaven? Even for rules that may be required, obviously we all fall short. How much can we fall short and still get in? Is it enough if you continue to try?
What would you characterize then as a “church rule” and seperate from God’s law?
I think most of what’s in the Church Handbook of Instruction consists of current administrative policies, not revelation or laws required to please God. The priesthood ban is a great example from the past. It was a church rule, even enforced by the church leaders, but it is now recognized as an error and not part of God’s law. My point is really that while the church and church leaders can hand down interpretations and rules, they aren’t necessarily infallible, and it’s your responsibility to study it out, seek God’s will, and confirm which rules and which interpretations constitute God’s law. I think God will judge you based on your own circumstances and understanding, and your rewards will be commensurate with your personal integrity rather than some inflexible, objective standard.