Freewill theists typically believe in universal atonement and universal sufficient/prevenient grace. However, exposure to the Gospel isn't universal in this life. Freewill theists have different strategies for finessing that tension.
William Lane Craig resorts to the creative conjecture that God uses middle knowledge to instantiate a feasible world in which none of the unreached would believe the Gospel if given the chance. For instance:
I’ve argued further that it’s at least possible that God has so providentially ordered the world that any person who would believe in the Gospel if he heard it will be born at a time and place in history at which he does hear it. Thus, no one is lost because of historical or geographical accident.God in His providence has so arranged the world that those who would respond to the Gospel if they heard it, do hear it. The sovereign God has so ordered human history that as the Gospel spreads out from first century Palestine, He places people in its path who would believe it if they heard it. Once the Gospel reaches a people, God providentially places there persons who He knew would respond to it if they heard it. In His love and mercy, God ensures that no one who would believe the Gospel if he heard it is born at a time and place in history where he fails to hear it. Those who do not respond to God's general revelation in nature and conscience and never hear the Gospel would not respond to it if they did hear it. Hence, no one is lost because of historical or geographical accident. Anyone who wants or even would want to be saved will be saved.
In the past, I've noted some basic problems with this, even on Craig's own grounds. But now I'd like to make a different point:
It's hard to see how his explanation accounts for the distribution-pattern in church history. For most of church history, Christians are bunched in the western hemisphere. By Craig's logic, that means Caucasians are, or at least used to be, more receptive to the Gospel than the Japanese, or Indian tribes in North and South America, or Pacific Islanders, &c. So many people-groups weren't evangelized for centuries because they were unreceptive to the Gospel–unlike Caucasians?
Europeans were evangelized while pre-Columbian indians were left in darkness...until the Conquistadors. And then, for some odd reason, post-Columbian Indian tribes are more receptive to the Gospel than their forebears.
Arabs were evangelized, but then you had the Muslim conquest, so the reason that Arabs during the Muslim era are generally unreached is because they are unreceptive to the Gospel, unlike their more open-minded ancestors. Really?
Now we see Christianity expanding in sub-Saharan Africa, the Far East, and even the Middle East, because, for some odd reason, this generation is more receptive to the Gospel, unlike their ill-disposed ancestors. How do disparities in the chronological and geographical distribution of the Gospel coincide with the receptivity of different ethnicities, or the same ethnicities at different times? Why is the distribution-pattern color-coded? And why does it alternate?
Presumably, as a freewill theist, he doesn't believe that some people-groups are inherently more receptive to the Gospel than others. So the correlation can't be pegged to that, can it?
So what's the differential factor? Cultural hostility to the Gospel? But it's not as if Viking culture (to take one example) was more welcoming to Christian missionaries than Confucian culture, is it? The initial challenge is always for Christianity to secure a foothold.