Your best is pretty horrible.
You like to quote this version in ISOLATION.
Mark 16:16 - He that believeth and is baptized shall be saved; but he that believeth not shall be damned.
But there is MUCH more to it than just that.
Mark 16:15-18 (AKJV/PCE)
(16:15) And he said unto them, Go ye into all the world, and preach the gospel to every creature. (16:16) He that believeth and is baptized shall be saved; but he that believeth not shall be damned. (16:17) And these signs shall follow them that believe; In my name shall they cast out devils; they shall speak with new tongues; (16:18) They shall take up serpents; and if they drink any deadly thing, it shall not hurt them; they shall lay hands on the sick, and they shall recover.
THESE things are ALL related to believing Israel and what THEY must endure to be saved (endure the great tribulation to the end to be saved to enter the kingdom).
Mark 16:16 is NOT talking about eternal life. This is clear by actually reading the Bible, like this part:
John 5:24 (AKJV/PCE)
(5:24) Verily, verily, I say unto you, He that heareth my word, and believeth on him that sent me, hath everlasting life, and shall not come into condemnation; but is passed from death unto life.
Was Jesus wrong to leave out your favorite water ceremony?
P.S. The more I study the Bible the less sure I am that Jesus is even talking about water baptism in Mark 16:16. He could well be talking about the baptism of fire that John the B spoke about as well. Matt 3:11, Luke 3:16