“I believe Pharaoh Zhoser’s references were to step pyramids, not the three great Giza Pyramids.”
Yes, but I don’t think Carson limited his remarks to the ones at Giza either, he was just talking about pyramids in general.
The theories you talk about which equate Imhotep and Joseph are probably based on the Famine Stela, because that mentions a seven year famine in the reign of Zhoser, just like the seven year famine during the pharoah’s reign when Joseph was in Egypt.
No mater which pyramids he was referring to, they were all built a 1,000 years or more before the time of Joseph and the Exodus as recorded in the Bible. See my Comment #141 for some good links and more info.