Jesus said it is required for salvation
Never.
He stated. (John 3) that you must be "Born....of water.. ( and that is of your mother)........and then you must be Born... .AGAIN..(of the Spirit).....and that is by the Holy Spirit.
There is also a large cult that teaches that Acts 2:38.....>"repent and be water baptized" is The Gospel.
And of course that's not a gospel....that is John the Baptist's demand for the Jews........that Peter was using, and later He didnt, once He met Paul and learned "The Gospel of the Grace of God".
Its the Catholic Cult........that teaches that water , the city water supply or any available water must be present, or a person can't receive God's Salvation.
I'll give you 3 situations where a person is born again and no water is present.
1.) In PRISON< in their prison cell.
2.) On your death bed, about to die, in the hospital....and you call out to God with faith in Christ and you are forgiven and saved.
3.) In a Foreign Country that does not allow Christianity, or Bibles, or water baptism..yet thousands per month are saved in these countries and there is no water baptism at that time.
Mark 16:16 He that believeth and is baptized shall be saved; but he that believeth not shall be damned.
So you'd better go get baptised
Let me show you the verse..
Notice the 2nd part of your verse....
But He that "believeth NOT"... shall be damned.
Notice that damnation is not related to WATER........its related to FAITH........as "Justfication by Faith" is the understanding.
Se, we are damned if we dont Believe in Christ........and we are SAVED..........if we do.
After we are saved, we are to be water baptized, .....as this is symbolic of "being risen in new Life with Christ" and its also a public confession of our faith.