A.T. Robertson Commentary Acts 15:11

"But we believe that we shall be saved through the grace of the Lord Jesus, in like manner as they." — Acts 15:11 (ASV)

That we shall be saved (σωθηνα). First aorist passive infinitive in indirect discourse after πιστευομεν. More exactly, "We believe that we are saved through the grace of the Lord Jesus in like manner as they also." This thoroughly Pauline note shows that whatever hopes the Judaizers had about Peter were false. His doctrine of grace is as clear as a bell. He has lifted his voice against salvation by ceremony and ritualism. It was a great deliverance.