Because of "Bible details"
1. for example in
Hebrews 10:4-12 where find that at the cross all sacrifices and offerings end.
2. And for example 1 Cor 7:19 where we see moral law continues (such as the Law where the 5th commandment is the first commandment with a promise - Eph 6:1-2), while ceremonial law like circumcision (which is not even in the TEN) ends..
Bible details on that "distinction" the Ten Commandments moral law of God written on the heart under the New Covenant and applicable to ALL mankind -- vs -- the ceremonial laws of offering and sacrifice... a d
istinction so incredibly obvious that almost all bible scholars in all denominations admit to them.
As we see here - time after time.
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I am glad these Sunday sources all affirm all TEN of the Ten Commandments for Christians.
The Baptist Confession of Faith,
the Westminster Confession of Faith ,
D.L. Moody,
R.C Sproul,
Matthew Henry,
Thomas Watson
Eastern Orthodox Catechism
The Catholic Catechism.
And of course 7th day groups
Seventh-day Baptists
Seventh-day Adventists
(and 100's of others)