[JHavard]

Do you keep kosher? Do you observe the Saturday Sabbath?

The answer to this is in the scripture you quote.

Deuteronomy 4 2 Do not add to what I command you and do not subtract from it, but keep the commands of the LORD your God that I give you.

These commands were for Israel, and that's who this refers to.

Who did God say this to? Did he say it to the Egyptian Pharaoh, or a heathen nation?

God holds those who he enters an agreement with, and not those who were not a part of it.

JH

[Invincibly Ignorant]

These commands were for Israel, and that's who this refers to.

Except for the fact that a mixed multitude came out of Egypt and any sojourners with them had to abide commands as well.

[malakhi]

God holds those who he enters an agreement with, and not those who were not a part of it.

Then those who are not a part of it should abstain from quoting those passages as support for their positions. If they are not relevent to the non-Catholic, then they can't be used to beat a Catholic over the head. Simple consistency.