Baptism matters.

“Know ye not, that so many of us as were baptized into Jesus Christ were baptized into his death? Therefore we are buried with him by baptism into death:”
Romans 6:3&4
“For as many of you as have been baptized into Christ have put on Christ.” Galatians 3:27
“and be baptized every one of you in the name of Jesus Christ for the remission of sins, ” Acts 2:38
“And now why tarriest thou? arise, and be baptized, and wash away thy sins, calling on the name of the Lord.” Acts 22:16
“The like figure whereunto even baptism doth also now save us..” 1 Peter 3:21

A more in-depth study of baptism.