No it's not and it's unbelievers who reject Him. You need to stop confusing salvation through faith which trusts in Christ alone for salvation (Ephesians 2:8,9) with an empty profession of faith/dead faith that remains alone - "barren of works." (James 2:14)
Acts 10:43 - All the prophets testify of Him, that through His name everyone who
believes in Him receives forgiveness of sins.
Romans 3:24 - being
justified freely by His grace through the redemption that is in Christ Jesus, 25 whom God set forth as a
propitiation by His blood, through faith, to demonstrate His righteousness, because in His forbearance God had passed over the sins that were previously committed, 26 to demonstrate at the present time His righteousness, that He might be just and
the justifier of the one who has faith in Jesus.
Acts 26:18 - to open their eyes, in order to turn them from darkness to light, and from the power of Satan to God, that they may
receive forgiveness of sins and an inheritance among those who are
sanctified by faith in Me.
Excellent article on Acts 22:16 -
WHAT IS TRUTH: Acts 22:16--Baptism Essential for Salvation?
In regards to Romans 6:3, "baptized into Christ Jesus" you assume means to be water baptized into the body of Christ, but this is erroneous. Believers are Spirit baptized (and not water baptized) into the body of Christ. (1 Corinthians 12:13) Just as 1 Corinthians 10:2 says that all (the Israelites) were "baptized into Moses" in the cloud and in the sea, but this does not mean that the Israelites were literally water baptized into the body of Moses, but in regards to "identification" and it's the same with water baptism. Before mentioning baptism in chapter 6, Paul had repeatedly emphasized that FAITH, not baptism is the instrumental cause of salvation/justification (Romans 1:16, 3:22-30; 4:4-6, 13; 5:1). That is when the old man was put to death and united in the likeness of His death, which water
baptism symbolizes and pictures. Righteousness is "imputed to us who believe in Him who raised up Jesus our Lord from the dead, who was delivered up because of our offenses, and was raised up because of our justification" (Romans 4:24,25).
1 Corinthians 12:13 - For by
one Spirit we were all
baptized into one body—whether Jews or Greeks, whether slaves or free—and have all been made to drink into one Spirit. This is
Spirit baptism, not water baptism.
Galatians 3:26 -
For you are all sons of God through faith in Christ Jesus (Period.) *Not through faith and water baptism. Also read John 1:12 - But as many as
received Him, to them
He gave the right to become children of God, to those who
believe in His name. *Received Him, given the right to become children of God, through believing in His name, not through water baptism.
Galatians 3:27 - For as many of you as were baptized into Christ have
put on/clothed yourself with Christ. The Greek word for "put on" is" enduo" and means to enclose oneself in, as when one "puts on" clothes or armor or some other item. Involved in this is the idea of "imitation" and "identification." Just as 1 Corinthians 10:2 says that all (the Israelites) were "baptized into Moses" in the cloud and in the sea, but this does not mean they were literally water baptized into the body of Moses, as I already explained to you.
"Let us therefore cast off the works of darkness, and let us
put on the armor of light...
put on the Lord Jesus Christ, and make not provision for the flesh, to fulfill the lusts thereof" (Romans 13:12,14). This exhortation is written to Christians (those already saved). Evidently then, baptism is not the only way to "put on" Christ. To "put on" Christ is to conform to Him, imitate Him. So it is in baptism; we "put on" Christ, conforming to Him in the ordinance that declares Him to be our Savior. So if "put on" Christ means saved through water baptism, apparently we are not saved yet. We must also "put on" Christ by making no provision for the flesh, to fulfill its lusts in order to be saved as well (Romans 13:14). Right? NO. This exhortation is to those ALREADY SAVED.
Paul wrote "put off the old man," and "put on the new man, which after God is created in righteousness and true holiness." (Ephesians 4:22,24) And,
"put on the whole armor of God, that ye may be able to stand against the wiles of the devil." (Ephesians 6:11) The allusion is to putting off old clothes and putting on new ones. One does not put on a uniform in order to become a soldier. Simply putting on a soldier's uniform does not make one become a soldier. Once one is made a soldier one is then able to put on and wear the uniform that distinguishes or marks them as a soldier. Putting on a judge's robe does not, in itself, make anyone become a "judge." But, one who has been made a judge is qualified to put on "judicial robes" and thus declare their qualifications.
So too with being water baptized, the new believer/Christian puts on robes for which they has previously been qualified to wear. The putting on of Christ is not what makes one become a Christian, but one which becomes a token of it, as in Romans 13:14. If one puts on the clothes of a Christian, in water baptism, without first becoming a Christian (child of God through faith), then one becomes an imposter, and is declaring, in baptism, to be what they are not.
There are a number of alleged prooftexts which are often cited to prove that the Bible makes baptism mandatory for salvation. Some of the most common such proof texts are Acts 2:38, Mark 16:16, John 3:5, Acts 22:16; Romans 6:3-4, and 1 Peter 3:21. A careful examination of each of these texts in context will show that none of them prove that baptism is absolutely necessary for salvation, though they do prove that baptism was an assumed initiatory response to the gospel of salvation. In other words, these texts prove only that baptism is
regularly associated with conversion and salvation, rather than absolutely required for salvation.