To further argue the point of water baptism being/or not being necessary for one's salvation, it's important to also look at the history and origins of "water baptism". It is a biblical fact that it does not always mean to "immerse in water" nor was the baptism as we know it originate in the New Testament.
Washings of the Old Testament
The Apostle Paul clearly notes the first baptism ever recorded in the bible (1 Cor. 10:1) as not even being associated with water
This baptism was in fact passing through the water on dry land and had nothing to do with immersion in water.
1Co 10:1 Moreover, brethren, I would not that ye should be ignorant, how that all our fathers were under the cloud, and all passed through the sea;
1Co 10:2 And were all baptized unto Moses in the cloud and in the sea;
As Barnes puts it:
They were baptized in the cloud and in the sea, and this cannot be understood as a religious rite administered by the hand of man. It is to be remembered that the word baptism has two senses - the one referring to the application of water as a religious rite, in whatever mode it is done; and the other the sense of dedicating, consecrating, initiating into, or bringing under obligation to.
The Hebrew word for baptism is ṭâbal and is translated plunge, or dip. The first occurrence of the word baptism appears in Job 9:31.
Job 9:31 Yet shalt thou plunge me in the ditch, and mine own clothes shall abhor me.
We also see an example of someone baptizing, himself seven times.
2Ki 5:14 Then went he down, and dipped himself seven times in Jordan, according to the saying of the man of God: and his flesh came again like unto the flesh of a little child, and he was clean.
Not to mention the Levitical washing which signified ones entrance into the priesthood.
Exo 19:6 And ye shall be unto me a kingdom of priests, and an holy nation. These are the words which thou shalt speak unto the children of Israel.
The Baptism, which John preached.
If John the Baptist came on the scene baptizing the nation of Israel only, and dealing with the national sins of Israel then we must also conclude that this was foreseen in the OT.
John came on the scene preparing the way by preaching the need for repentance to the nation of Israel
Their King was on the way, a 180 was needed.
Mar 1:2-4 KJV
(2) As it is written in the prophets, Behold, I send my messenger before thy face, which shall prepare thy way before thee.
(3) The voice of one crying in the wilderness, Prepare ye the way of the Lord, make his paths straight.
(4) John did baptize in the wilderness, and preach the baptism of repentance for the remission of sins.
The condition of Israel at the first coming of the Lord was no different than what we see Isaiah talking about here
Isa 1:4-5 KJV
(4) Ah sinful nation, a people laden with iniquity, a seed of evildoers, children that are corrupters: they have forsaken the LORD, they have provoked the Holy One of Israel unto anger, they are gone away backward.
(5) Why should ye be stricken any more? ye will revolt more and more: the whole head is sick, and the whole heart faint.
A sinful nation that had forsaken the LORD. No one will argue that Jesus did not come in the flesh as King to the children of Israel; this baptism of repentance was an acceptance of that King. The period in Acts (at least the first few chapters) was no different.
Act 3:19 Repent ye therefore, and be converted, that your sins may be blotted out, when the times of refreshing shall come from the presence of the Lord;
Act 3:20 And he shall send Jesus Christ, which before was preached unto you:
Pauls Baptism.
I think Ive covered this in my previous posts. Ill say one thing. Paul was appointed the gospel of Grace; Paul was also appointed the ministry TO the gentiles. So what did Paul say?
1Co 1:17 For Christ sent me not to baptize (unlike John the Baptist), but to preach the gospel: not with wisdom of words, lest the cross of Christ should be made of none effect.
Eph 4:5 One Lord, one faith, one baptism,
Col 2:11 In whom also ye are circumcised with the circumcision made without hands, in putting off the body of the sins of the flesh by the circumcision of Christ:
Col 2:12 Buried with him in baptism, wherein also ye are risen with him through the faith of the operation of God, who hath raised him from the dead.
Surely we still have the baptism of Death today; as its the circumcision made without hands.