QUOTE(Goldfish @ Nov 4 2007, 06:11 PM)

Are we really expected to believe this literally? It seems a bit inconvenient to walk around on your head (hands?).
1. It's a very late "midrash", without a source in divrei Chazal as far as I know.
2. Since when are midrashim all literal as opposed to imparting a didactic lesson?
3. He was dead, a ghost, or at least resurrected. That doesn't bother you but walking upside does?
QUOTE
Why would it have changed because of the Crusades/Catholic polemics?
I don't understand the complete argument, but it has to do with the place of the concept of resurrected biblical figures with analogies of course to the Catholic false messiah who was supposedly killed and then resurrected. Keep in mind that the Binding of Isaac plays a key role in Catholic theology and that Jewish views of it will necessarily be influenced by the prevailing Catholic views, as well as being influenced by the concept of martydom, a concept that changed dramatically during the Crusades. [I heard that the Friedike Cardinal of the archdiocese of Toronto had nothing on his desk except for a statue of the Binding of Isaac]. But it also explains, for example, why the Ashkenaz poskim [the source above, as indicated by the footnote, was the Minchat Yehudah, which was written by R. Yehuda ben Eliezer, in 1313 CE] were much more accepting of the concept of a martyred and resurrected Isaac than were the Sephardi commentators such as Ibn Ezra who said any such belief that Yitchaka's ashes are on har hamoriah is heresy.