No, some people who live in remote jungle regions have never heard the Gospel message. In addition, millions of people who have died did not hear the Gospel message. Apparently, God wants people to hear the Gospel message, but only if another person tells them about it. That makes sense since God wants people to have enough food to eat, but only if they are able to obtain it through human effort.
Of course, if the God of the Bible does not exist, people would only be able to hear the Gospel message and obtain food through human effort.
Yes I agree some people may not know about the christian religion and most certainly people in the OT did not but that will not stop God from making it known to them for their salvation.
What we today should be concerned with is our own salvation. God will take care of others when it is their turn. Certain things are beyond human effort.