38 Then Peter said unto them, Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins, and ye shall receive the gift of the Holy Ghost....You may have been saved during baptism, if that is the moment you believed. But baptism didn't save you and neither did the words spoken over you. You want to put God in a little box where he can only save during a certain ceremony? God refuses to fit.
6 Then Peter said, Silver and gold have I none; but such as I have give I thee: In the name of Jesus Christ of Nazareth rise up and walk.
16 And his name through faith in his name hath made this man strong, whom ye see and know: yea, the faith which is by him hath given him this perfect soundness in the presence of you all...
10 Be it known unto you all, and to all the people of Israel, that by the name of Jesus Christ of Nazareth, whom ye crucified, whom God raised from the dead, even by him doth this man stand here before you whole...
.18 And they called them, and commanded them not to speak at all nor teach in the name of Jesus.
Peter just had a bad habit of using and verbally speaking the name of Jesus Christ to do all these things in Acts.
He was told to not say "Jesus" when doing these exploits anymore.
Kinda like what modern Christendom tells us today.