I'm a little late responding to your question: Are you saying that Paul also taught the requirement for water baptism for remission of sins, as was taught in the four gospels? No, Paul taught baptism with the Holy Spirit, by which believers become one spiritual body (1CR 12:13. Harmonizing this with references to water baptism in the gospels, we arrive at this understanding:
At the moment of repentance/acceptance, God’s Holy Spirit enters converts' spiritual hearts (RV 3:20), uniting them with God as heavenly Father (RM 8:9) and identifying them with Christ’s worldwide/catholic body or church (CL 1:18). This manifold event is called spiritual birth or baptism (1CR 12:13). We can infer that this dynamic occurs also for pre-NT believers, because there is no salvation outside of Christ’s ekklesia or church (ACTS 4:12). Partial knowledge of God’s Word will limit ability to cooperate with Him, so there is a need for evangelism or learning the full Gospel (MT 28:18-20, cf. ACTS 18:24-26) as well as for lifelong discipleship or spiritual training (2TM 3:16-17).
Confusion may arise from the fact that in Ephesians 4:5 Paul says there is only one baptism, but elsewhere the NT seems to refer to two types of baptism: one by water and another by the Holy Spirit. In His “Great Commission” Jesus tied saving faith closely to the work of water baptism when He said “Make disciples of all nations, baptizing them” (MT 28:19). Yet, in 1 Corinthians 12:13 Paul wrote that “We were all baptized by one Spirit into one body.” This suggests that spirit baptism occurs at the moment of conversion, when the Holy Spirit unites the new saint (saved sinner/soul) with Christ, because “if anyone does not have the Spirit of Christ, he does not belong to Christ.” (RM 8:9) The indwelling of the Holy Spirit may also be called the initial filling by the Holy Spirit, because at the point of confession and conversion a person is cooperating fully with God. (See RM 6:3-7, GL 2:20) The evidence that a person has been baptized by God’s Spirit or included in Christ’s spiritual body is love in its myriad of forms (GL 5:22-23, JN 13:35).
Any confusion is resolved by understanding that the two types of baptism are united if baptism with water is viewed as a symbolic way of portraying baptism by the Holy Spirit. The details for this work are vague, but the mode of immersion best portrays a Believer’s spiritual union with Christ in His death, burial and resurrection to eternal life (CL 2:12, RM 6:4). As a practical matter, a new Believer normally would be baptized by the local congregation of the catholic (worldwide) church in which he/she will want to participate as an acknowledged member. Water baptism symbolizes spiritual baptism.
Instead of commanding water baptism for salvation, Paul said in one place (RM 10:9-10) that a convert should confess “with your mouth” in order to be saved, even though elsewhere (EPH 2:8-9) he taught that one is saved by faith. Both outward confession and water baptism may be seen as works manifesting love for God that every new Believer will want to (but we cannot say “must”) perform as soon as possible following his/her decision to have saving faith (cf. MT 3:13-15, ACTS 2:38).
At the moment of repentance/acceptance, God’s Holy Spirit enters converts' spiritual hearts (RV 3:20), uniting them with God as heavenly Father (RM 8:9) and identifying them with Christ’s worldwide/catholic body or church (CL 1:18). This manifold event is called spiritual birth or baptism (1CR 12:13). We can infer that this dynamic occurs also for pre-NT believers, because there is no salvation outside of Christ’s ekklesia or church (ACTS 4:12). Partial knowledge of God’s Word will limit ability to cooperate with Him, so there is a need for evangelism or learning the full Gospel (MT 28:18-20, cf. ACTS 18:24-26) as well as for lifelong discipleship or spiritual training (2TM 3:16-17).
Confusion may arise from the fact that in Ephesians 4:5 Paul says there is only one baptism, but elsewhere the NT seems to refer to two types of baptism: one by water and another by the Holy Spirit. In His “Great Commission” Jesus tied saving faith closely to the work of water baptism when He said “Make disciples of all nations, baptizing them” (MT 28:19). Yet, in 1 Corinthians 12:13 Paul wrote that “We were all baptized by one Spirit into one body.” This suggests that spirit baptism occurs at the moment of conversion, when the Holy Spirit unites the new saint (saved sinner/soul) with Christ, because “if anyone does not have the Spirit of Christ, he does not belong to Christ.” (RM 8:9) The indwelling of the Holy Spirit may also be called the initial filling by the Holy Spirit, because at the point of confession and conversion a person is cooperating fully with God. (See RM 6:3-7, GL 2:20) The evidence that a person has been baptized by God’s Spirit or included in Christ’s spiritual body is love in its myriad of forms (GL 5:22-23, JN 13:35).
Any confusion is resolved by understanding that the two types of baptism are united if baptism with water is viewed as a symbolic way of portraying baptism by the Holy Spirit. The details for this work are vague, but the mode of immersion best portrays a Believer’s spiritual union with Christ in His death, burial and resurrection to eternal life (CL 2:12, RM 6:4). As a practical matter, a new Believer normally would be baptized by the local congregation of the catholic (worldwide) church in which he/she will want to participate as an acknowledged member. Water baptism symbolizes spiritual baptism.
Instead of commanding water baptism for salvation, Paul said in one place (RM 10:9-10) that a convert should confess “with your mouth” in order to be saved, even though elsewhere (EPH 2:8-9) he taught that one is saved by faith. Both outward confession and water baptism may be seen as works manifesting love for God that every new Believer will want to (but we cannot say “must”) perform as soon as possible following his/her decision to have saving faith (cf. MT 3:13-15, ACTS 2:38).
1 Corinthians 15:1-4
1 Moreover, brethren, I declare unto you the gospel which I preached unto you, which also ye have received, and wherein ye stand;
2 By which also ye are saved, if ye keep in memory what I preached unto you, unless ye have believed in vain.
3 For I delivered unto you first of all that which I also received, how that Christ died for our sins according to the scriptures;
4 And that he was buried, and that he rose again the third day according to the scriptures:
Peter, James and John preached water baptism unto salvation, but not Paul since the eleven were under the Kingdom Gospel, but the mystery revealed to Paul by Christ Jesus was the Gospel of Grace without works.
Does that clarify?
MM