You think people didn’t know about other gods until they could drive? Technology gives people corn syrup and adderall while religion can’t fix a toothache. People increasingly believe this means that one is better than another or that they are even attempting to solve the same problems and must be exclusively selected. And Science is just as much a religion as Christianity or any other religion at this point. “Trust the Science”, “I Believe Science is Real”, “Science is True Whether You Believe in it or Not”
I don't fully understand the point you are trying to make, and how science plays a role in this discussion.
Apart from this diversion, I do think people heard about other gods alright, but communities used to be quite isolated. It has been possible to collectively ignore other religions for centuries. Technological developments in transport and information distribution, such as the printing press, may have made it increasingly harder to keep a lid on the group think. Seems like a reasonable argument, no?