Oh, and on the original point, any reasonable person would have inferred that "Marked Safe" was a reference to the lamb's blood. But that was in fact not a protection against the pharaoh, but against - as I pointed out - the deity.
So even if you accepted the biblical account - and most scholars and scientists now agree there actually is no evidence for the traditional exodus in the abundant Egyptian historical records, even if you correct the implausible numbers downward - the wrath and smiting of innocents was still at the hand of the deity instead.
Here's from the Wikipedia article on the exodus: "Scholars are broadly agreed that the Exodus story was composed in the 5th century BCE.[5] The traditions behind it can be traced in the writings of the 8th-century BCE prophets,[6][7] but it has no historical basis.[8] Instead, archaeology suggests a native Canaanite origin for ancient Israel.[9]"
If I have any "envy," it's in any case not of your intellectual failure to grasp the meaning of a simple critique of your meme idea.