Cavemen? Maybe 20,000 years ago.
10,000 years ago we were planting crops and forming cities. They weren't built to last the ages like Rome, but dirt cities are still cities.
Besides, Ubumfejn-Hooga-booga is the FALSE GOD. The REAL God is Ubumfejn-Booga-Hooga. But nobody has worshipped her since 12,527 B.C.E. after a high-priest got drunk on fermented fruit and accidentally swapped the name while reciting The Old Ways, and who's gonna correct the high-Priest?
If you want to reenact it, I won't complain.
Heck, I might even go crazy and golf clap a bit.