Matthew 4:17 ESV
“From that time Jesus began to preach, saying, “Repent, for the kingdom of heaven is at hand.””
Why is it that Christ did not start his ministry saying, "You all need to be baptized," and instead said the above?
Because the first thing needed is belief in Jesus. If there is no belief, then baptism just gets you wet and nothing else.
Acts 16:30–31 ESV
“Then he brought them out and said, “Sirs, what must I do to be saved?” And they said, “Believe in the Lord Jesus, and you will be saved, you and your household.””
Why was the condition for salvation belief in the Lord Jesus and not baptism?
That is all that is mentioned, but it was not all that was taught (as I will show below).
Mark 16:16 ESV
““Whoever believes and is baptized will be saved, but whoever does not believe will be condemned.””
Why didn't Jesus say, "whoever is not baptized will be condemned?"
Again, if they didn’t believe then baptism would be meaningless.
I can only assume that someone can be saved without being baptized. Of course, this does not mean that baptism is "bad" or that we should not be baptized. All it means is that baptism is not as fundamental to being a Christian as faith is.
That might be the case if we didn’t have direct association between baptism and salvation, but we do, that your assumption would leave those people lost in sin.
Now, I know people are going to appeal to church history here. But consider...
1 Corinthians 1:14 ESV
“I thank God that I baptized none of you except Crispus and Gaius,”
So the question becomes, "Who baptized these people?"
Crispus, Gaius, the people they baptized, Apollos, or Cephas. This was the division that Paul was attacking.
And if Christ Himself never baptized anyone but calls everyone to repent, what does that say?
Nothing at all.
Let’s look at what Scripture say about the connection between baptism and salvation:
Let’s start with one of your passages.
Mark 16:15-16 -
“And He said to them, “Go into all the world and preach the gospel to all creation. The one who has believed and has been baptized will be saved; but the one who has not believed will be condemned.”
He does not address someone who
believes but is not baptized because that is an oxymoron. If you really believe then you will obey, because that is what faith is.
Acts 2:37-38 -
“Now when they heard this, they were pierced to the heart, and said to Peter and the rest of the apostles, “Brothers, what are we to do?” Peter said to them, “Repent, and each of you be baptized in the name of Jesus Christ for the forgiveness of your sins; and you will receive the gift of the Holy Spirit.”
They were pierced to the heart. I think that means they believed the message Peter was preaching (that Jesus is the Messiah).
Next these men asked, “What are we to do (to be saved from the consequences of killing the Messiah)?” Contrary to how some would put it, Peter didn’t say that there is nothing left to do because Jesus did it all on the cross. No, Peter said, “Repent and be baptized for (so that you can receive) the forgiveness of your sins”.
Some would claim “for” here means “because you have received”. But that wouldn’t fit with Acts 3:19, which says,
“Therefore repent and return, so that your sins may be wiped away, in order that times of refreshing may come from the presence of the Lord”
2:38 doesn’t give any indication that we repent
so that we can be forgiven and then are baptized
because we have been forgiven. No, the same meaning of “for” must be used for both, and it must agree with 3:19.
Acts 8:36 -
“Then Philip opened his mouth, and beginning from this Scripture (Isaiah) he preached Jesus to him. As they went along the road they came to some water; and the eunuch *said, “Look! Water! What prevents me from being baptized?””
From this passage we see that baptism was taught from the very beginning as part of “preach[ing]Jesus”, and that it was water baptism, not Spirit baptism.
Rom 6:1-7 -
“What shall we say then? Are we to continue in sin so that grace may increase? Far from it! How shall we who died to sin still live in it? Or do you not know that all of us who have been baptized into Christ Jesus have been baptized into His death? Therefore we have been buried with Him through baptism into death, so that, just as Christ was raised from the dead through the glory of the Father, so we too may walk in newness of life. For if we have become united with Him in the likeness of His death, certainly we shall also be in the likeness of His resurrection, knowing this, that our old self was crucified with Him, in order that our body of sin might be done away with, so that we would no longer be slaves to sin; for the one who has died is freed from sin.”
Paul tells us that those who have been baptized into Christ have died to sin and been united with Christ in a new life. And
IF we have been united with Him in likeness of His death (baptism),
THEN we will also be like Him in His resurrection.
If not….
Col 2:11-14 -
“and in Him you were also circumcised with a circumcision performed without hands, in the removal of the body of the flesh by the circumcision of Christ, having been buried with Him in baptism, in which you were also raised with Him through faith in the working of God, who raised Him from the dead. And when you were dead in your wrongdoings and the uncircumcision of your flesh, He made you alive together with Him, having forgiven us all our wrongdoings, having canceled the certificate of debt consisting of decrees against us, which was hostile to us; and He has taken it out of the way, having nailed it to the cross.”
Paul tells us here, like in Romans, that in (during) baptism the Holy Spirit cuts (circumcises) our sin and sin nature from us, forgiving all our sins and making us alive in Christ.
Acts 22:16 -
“Now why do you delay? Get up and be baptized, and wash away your sins, calling on His name.’”
Now wait a minute, if his sins were forgiven when he believed, (it is clearly evident that he believed by his conversation with Jesus in Acts 9), then he wouldn’t have any sin to wash away three days later when Ananias came to him. But Ananias, through the Holy Spirit, absolutely tells Saul that he is still in sin and must have them washed away
in baptism while calling on the name of the Lord.