See on Rom 6:4. The aorist tense puts the burial as contemporaneous with the circumcision. Ye were circumcised when ye were buried, etc.
In baptism (ἐν τῷ βαπτίσματι or βαπτισμῷ)
The article, the baptism points to the familiar rite, or may have the force of your.
Wherein also (ἐν ᾧ καὶ)
Referring to baptism, not to Christ.
Ye were raised with Him (συνηγέρθητε)
The burial and the raising are both typified in baptism. The raising is not the resurrection to eternal life at Christ's second coming, but the moral resurrection to a new life. This corresponds with the drift of the entire passage, with the figurative sense of buried, and with Rom 6:4, which is decisive.
Through the faith of the operation of God
Not the faith which God works, but your faith in God's working: faith in God's energy as displayed in Christ's resurrection. Hence the emphasis which is laid on faith in the resurrection. See 1Co 15:3, 1Co 15:4 (note); Rom 10:9; Eph 1:19. Col 2:11, Col 2:12 should be compared with Rom 6:2-6.