You might see it as rubbish, but I see it as truth and we need not be rude and put down another for what they believe.
John the Baptist was preaching repentance for the forgiveness of sins to prepare themselves for the coming of Messiah. The water was a symbol of cleansing as John spoke to the people that the Messiah would come after him baptizing with the Holy Ghost and with fire, Matthew 3:11. We are now washed in the blood of the Lamb and renewed by the Holy Ghost, Acts16:30-33; Titus 3:5-7; Rev 1:5.
In Acts 2:36-39 Peter says to repent first and then be baptized in the name of Jesus for the remission of sins and you shall receive the gift of the Holy Ghost. The baptism of Christ is to repent first and then you will receive the gift of the Holy Spirit.
John the baptist said that Jesus must increase as now they had the living word (water) and that John's baptism in actual water must decrease as John's baptism in water was only for repentance only as from that time forth Jesus will baptize with the Holy Spirit and fire, Matthew 3:11. Paul said in 1Corinthians 1:17 that Christ did not send him out to baptize, but to preach the gospel just as the Disciples were sent out to teach all nations baptizing them in the name of the Father, Son and Holy Ghost, Matthew 28:18-20.
The word water in John 3:5 means the living word of God as in John 4:13,14; Acts 10:47; Hebrews 10:22; John 5:6,8; Rev 21:6; 22:1,17; Matthew 3:11; Mark 1:8; Luke 3:16; John 1:32-34; Acts 11:16
John 4:13 Jesus answered and said unto her, Whosoever drinketh of this water shall thirst again:
John 4:14 But whosoever drinketh of the water that I shall give him shall never thirst; but the water that I shall give him shall be in him a well of water springing up into everlasting life.