Nobody is going to do any research based on what you said in your post.
And the problem, for the Bible believer, regarding the question: “Can people who have never heard the gospel be saved?” is not going to go away.
The traditional view is that God puts then into eternal Hell.
But that does not harmonize with “God is love.”
Or with common sense.
So?
So we have to find a solution to this problem and the OP is a good place to start.
Best
JAG
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PS
Is it not reasonable to believe that the person who responds favorably
to his limited knowledge of God revealed to him in natural law and
conscience in the absence of the gospel in his part of the world
and in his time in history, would also respond favorably to the gospel
preached in our world today?
My view: Yes it is reasonable to believe that.
You cannot assign to God your own definition of "love". God does not fit our standards. We are commanded to fit His, which is impossible outside of Christ. To assume that anyone can come to God any other way than through Christ is to say that Christ died for no reason.