Chacha,
I believe there might be some needed clarification on this. Remember, Acts is a book of recorded events, not of doctrinal teaching. The book of Romans, however, is a book of doctrine. Keeping this distinction in mind, note that scriptures in Romans and other "doctrinal" epistles strongly imply a change of heart, i.e. giving oneself over to Christ. Now note how the instances of water baptism mentioned in Acts are the outward manifestation of one's new found faith in Christ. Also note another instance of saving faith: the thief on the cross. One can deuce from this that repentance, belief (faith) in Christ and accepting His work on the cross as final is enough to be accepted by God. Water baptism is the outward testimony of our faith, not a needed work that garnishes more of God's love.
Check it out. Check Him out.