Baptism is symbolic of the spiritual death and resurrection of that occurs at conversion which is for the remission sins. After baptism one is expected to walk in newness of life (Acts 2:41, Rom. 6:3-4). Salvation and baptism usually occur together in Scripture (Acts 2:41; Acts 10:48). However, a person may exhibit faith in Jesus without having experienced water baptism and is still be saved by faith in Christ.(Luke 23:43).
The Sacrament of the Lord’s supper was instituted by Christ at the last supper. It is to be performed in remembrance of him and in community. The believer who takes communion is showing their continued faith in Christ and participation in the body of Christ for salvation. The Bread represents the body of Christ which is broken for us although it is not actually the body of Christ. The drink represents the blood of the New Covenant in Christ. The frequency the supper is to be taken is not specified in Scripture. The supper is taken as a symbol of the Lord’s death, and is to done until he comes again in glory (I Cor. 11).
I think that these two events must be habitual in the life of a church if we are fulfilling Jesus’ mandate in the Great Commission!