Why Protestant churches dont keep the Sabbath.

[jonathanbrickman0000]

Sabbath keeping with all it's rules and regulations, was part of a covenant with Israel (Exodus 16:23, 29; 31:12-18; 35:1-3; Leviticus 19:30; 23:2-3, 32; Numbers 15:32-36; 28:1-10; 29:39-40; I Chronicles. 23:30-31; II Chronicles 31:2-4; Isaiah 1:13; Amos 8:5; Nehemiah 10:31) that is not binding on Christians under the new covenant. (Colossians 2:16-17)

And there can be nothing binding upon, that can bind, anyone who is One of They who are God.