Well, going back to the start of it all: We can assume the words of Our Lord Jesus were the same the Apostles preached. With all it’s exigence and stringiness. I’m reminded that all the beauties and difficulties in the Pauline letters would have been the same.
Then, it was a very different world. Those first Christians must have been touched in their hearts, and reason, by the example of the first, and only religion, that preached lifelong marriage and indissolubility. Not only that, but meekness and humility in a world of violence and power.
They also, certainly, saw themselves even more different from the world around them given there were no human rights and inhumane laws&lawlessness being prevalent.
Perhaps even more, it is said both miracles and prophecy were more widespread in the times of the emergent church. For the church at its beginning had greater needs of visible signs and Our Lord operated those signs in favor of His church.
Now, the specific answer: Will we be saved, and did they consider “being saved” easy or only for the selected few? In that heathen surrounding they’d be more sure, yet the demands of moral conduct were still on them. I also tend to believe that the refined Pauline letters wouldn’t have been understood by everyone if preached that way.
So, when I look at the majority of the elderly ladies in my village -who hardly know how to read and write- and with all their defects lead saintly lives, I’d say they wouldn’t be “certain” but express “great faith” meaning they really really hope to go to heaven, and have confidence Our Lord will get them there.
The “sinners are going to hell” simply seems to coexist in catholic literature since Saint Paul. The best words about this are from Jesus. And I do fear the consequences of sin, and still hope in the Lord.