Unprofitable Servant wrote:
Baptism is an ordinance not a sacrament

Sacrament:-
"Ecclesiastical . a visible sign of an inward grace, especially one of the solemn Christian rites considered to have been instituted by Jesus Christ to symbolize or confer grace: the sacraments of the Protestant churches are baptism and the Lord's Supper;"

No wonder they have difficulties understanding the Old Testament.

"WCF 28/1 Baptism is a sacrament of the New Testament, ordained by Jesus Christ,a not only for the solemn admission of the party baptized into the visible Church,b but also to be unto him a sign and seal of the covenant of grace,c of his ingrafting into Christ,d of regeneration,e of remission of sins,f and of his giving up unto God, through Jesus Christ, to walk in newness of life:g which sacrament is, by Christ’s own appointment, to be continued in his Church until the end of the world.h"

a. Mat 28:19. • b. 1 Cor 12:13. • c. Rom 4:11 with Col 2:11-12. • d. Rom 6:5; Gal 3:27. • e. Titus 3:5. • f. Mark 1:4. • g. Rom 6:3-4. • h. Mat 28:19-20.