Not possible. New religions crop up every day. Many old religions have died out and left no record. We know a bit about ancient Egyptian Sun god worship, but not a lot. Various tribes of humans roamed widely in small groups, each developing their religious theories. Most of those are long lost. We see today a few of those that caught on and survived into the modern era. Pagans were largely wiped out in Europe, and so today we have neo-paganism, an emerging new religion. But there are many others, many variants. A lot of new-age stuff.