1 COR. 12: 13-14 "For by one Spirit are we all baptized into one body, whether we be Jews, or Gentiles, whether we bond or free; and have been all made to drink into one Spirit. For the body is not one member, but many."
The Bible clearly teaches there are two baptisms. One is Spiritual and by the Holy Spirit of God; while the other is only water baptism and can be done by man. To actually be saved we must be baptized into the family of God by His Holy Spirit, and this will only happen to those who believe in Jesus Christ. It is faith in Christ that qualifies us to become a son of God and be baptized as performed by the Holy Ghost. The baptism performed by water is only water baptism and is not essential to salvation. No man has any power to save a soul. If water baptism performed by man could save, it would be criminal neglect to not force water baptism upon others regardless of what method might become necessary to accomplish the act. The great Apostle Peter had a good thought on this in his sermon on the day of Pentecost. ACTS 2:38 "Then Peter said unto them, 'Repent, and be baptized in the name of Jesus Christ for the remission of sins, and ye shall receive the gift of the Holy Ghost.' Then there is a message in Mark 16:16 "He that believeth and is baptized shall be saved: but he that believeth not shall be damned." Of course these above scriptures allude to the Holy Ghost Spiritual baptism and we should be warned where Jesus said you would be damned if you are not baptized. Then look further where Jesus said in ACTS 1:5 "For John truly baptized with water, but ye shall be baptized with the Holy Ghost not many days hence."
They did baptize in the Old Testament times under the old covenant, and Jesus Christ was even mentioned before He was born and under the old covenant. Notice how Paul explained it in 1 COR. 10-4:2 "And they were all baptized unto Moses in the cloud and in the sea. And did all eat the same Spiritual meat; and did all drink the same Spiritual drink; for they drank of the Spiritual Rock that followed them and that Rock was Christ." We know Moses was considered as a symbol of salvation in the Old Testament before Christ became our sacred Savior under the new convenant found in the New Testament.
Going to church and being baptized are worthy things to do and all should do them, but going to church and being baptized cannot save any person's soul; unless faith in Jesus Christ was given by the Holy Ghost to prompt the action. Jesus Christ paid a terrible price before God qualified Him and sent Him to be our Savior. He is worthy of our sincerest love, and deepest praise and devotion.