Joseph lived around 2000 years ago, the Great Pyramid was built 4500 years ago. Long before Joseph stored grain.
I didn't say that I believed the pyramids were built for grain storage. I have read extensively about the subject. I'm saying someone who hasn't could believe it without being a wacko.
Christ lived about 2000 years ago. However, the Joseph of the great famine was one of the 12 tribal patriarchs and lived about 4500 years ago. Joseph and the famine brought the children of Israel (Jacob, whom God renamed Israel, and his other 11 sons and their families) into Egypt, and eventually into slavery. I have heard, several times from religious and non-religious sources, that the Jews of the Exodus account are believed to be the slaves who built the pyramids.