I grew up in the Churches of Christ and most don't consider others christians who haven't been water baptized.
I addressed this recently on my podcast on 'The Neptune Project.'
but really, here is something from Acts 16 that is interesting
31 They replied, “Believe in the Lord Jesus, and you will be saved—you and your household.” 32 Then they spoke the word of the Lord to him and to all the others in his house. 33 At that hour of the night the jailer took them and washed their wounds; then immediately he and all his household were baptized.
so something in this passage "They they spoke the word of the lord to him" was obviously important. Possibly a command in that WORD for baptism and something immediately that needed to be done....it obviously plays a role in fulfilling salvation by belief.
Now, i addressed this recently in the churches of christ in that I personally believe God can save someone without baptism, such as an elderly woman in a nursing home who can't get to a baptistry obviously.
but ordinarily, i don't teach belief without baptism as Jesus went through his baptism that being "the death burial and resurrection." remember, he said he had a baptism to undergo.
so we too out of respect for God (Jesus said, it is proper (respect) for us to do this) need to participate in the death, burial, and resurrection of Christ.