EasyPrompt, correct,"The Bible is clear that there will be a great crowd of non-believers who survive the great tribulation"
The great crowd unlike WT teaching are last minute survivors that survive the GT. They are like the large crowd of Egyptians and other non Jews that followed Moses out of Egypt In the days of Exodus.
Exodus 12:37,38:KJV "37And the children of Israel(=Jews) journeyed from Rameses to Succoth, about six hundred thousand on foot that were men, beside children. 38And a mixed multitude(=Great crowd of non Jews) went up also with them; and flocks, and herds, even very much cattle"