"and you were buried with him in baptism, in which you were also raised with him through your faith in the working of God, who raised him from the dead."
Baptism is an act of faith. It is through our faith in God working when we are baptized that we are saved. This is what distinguishes baptism from bathing. We have faith that when we are baptized, God unites us into Christ’s own death, burial and resurrection. This passage teaches the same thing as Romans 6:3-6.
Faith is the “active ingredient” at baptism, and without faith, baptism means nothing.