It is important to find common ground. The word precepts is something some non-Catholic Christians should be familiar with. They are the minimum requirements which God expects from us.
Catholics believe that Christ speaks through the Church, and that the Church teaches us the precepts of Christ. We call these “obligations”.
Non-Catholic Christians have precepts, even if they don’t call them by that name. In it’s simplest form it is to believe in Jesus Christ or accept Jesus Christ as your Lord and Savior, or some expression of that idea.
Many non-Catholic Christians also understand the obligation to worship God, however they might define worship. We all understand that we owe God worship, it is His by right. They might not express it as “holy day of obligation” but we have all heard non-Catholics say things like, “you must bend the knee.” The obligation to “bend the knee” is almost universally understood. This is a precept.
In fact, one of the most popular non-Catholic Bible studies around Kay Aurthur’s “Precept on Precept” by precept.org.
Both non-Catholics and Catholics have precepts or obligations, and some are quite similar. We express them differently and believe differently about whether the Church can bind us to those obligations on behalf of God. But we all have obligations.