There is one gospel.
Eph. 4:5
Anyone preaching anything other than that one gospel is accursed.
Gal. 1:8-9
We are to earnestly contend for that faith...
Jude 1:3
That faith was once for all delivered to the saints
Jude 1:3
That faith was delivered on the day of Pentecost when Peter and the other Disciples fulfilled the command of Christ.
If we are to do everything in the name of Christ then baptism is indeed a "deed" that must be done in Jesus' name.
Col. 3:17
There is no other way but through Jesus Christ.