It can't be a subject that demands years of study just to figure out the why, how and who of it. Therefore, the person who reject's any attitude or doctrine mentioned in this section, is guilty of spreading division. Such would be divisive and contentious behavior. God tells us to reject such. Hence, those who preach that baptism isn't necessary for salvation, are guilty of spreading division in the body of Christ.
Water baptism is the one entrance into the one body.
The Holy Spirit would never move or inspire any man to preach against water baptism. In fact, when the Holy Spirit did inspire men to preach, the message preached to the lost contained teaching stressing the necessity of being baptized. Such a person didn't exist in the First Century. We are told that all you have to do in order to gain salvation is accept in your heart that Jesus is your personal Saviour. I find something different happening in the New Testament.