"Then Moses summoned all the elders of Israel and said to them, "Go at once and select the animals for your families and slaughter the Passover lamb."
Ew, I'm vegan and I don't have a license nor the money for a lamb, so breaking in, stealing and slaughtering a lamb and doing rituals with its carcass publicly apparently?
Good news! That's not a commandment, it's just part of a story, so there isn't actually anything to follow.
If we're playing a reenactment game instead of a follow-what-the-Bible-tells-you-to-do game, then in context the alternative is that your first born son dies and all you have to do to prevent it is put a little blood on your door for one night. Seems like a trade anyone would readily take. Also, it's not illegal and it's not a ritual. It's just regular old slaughter of an animal like we do thousands/millions of times a day in society.
Thanks for the context! But why does an omnipotent and omniscient deity need me to slaughter an animal and smear it's blood on my door to keep him from killing an innocent child? Since he's omniscient and all, couldn't he just, ya know, pass over my house anyway since he already knows my child isn't one of the thousands of innocent children he intended to slaughter on this particular night?