Did the early christians think they were the only faith people as a church that taught the way on Jesus's and his father's behalf and so people listening to them and inspired utterences that were given them would saved?
Yes they did, but JW's are not the early Christians. First century Christians had actually seen Christ, or could talk to someone who has. Has the GB seen Christ? Do they talk directly to him? When you really examine the historical record the beliefs, practices, and organizational procedures of the first century Christians are nothing like JW's.
Here's a question for you, what was the organizational code for the official time slip that the first century governing body required all first century Christians to turn in each month?