And when your children ask you, ‘What does this ceremony mean to you?’ then tell them, ‘It is the Passover sacrifice to the Lord, who passed over the houses of the Israelites in Egypt and spared our homes when he struck down the Egyptians.’ Then the people bowed down and worshiped.

The obvious question that comes up when reading about the plague that killed every firstborn child in the Egyptian households is: why did God choose to kill all those people? What do you think?
This is a hard question to answer, but perhaps the best thought comes from within the story itself, that what the story means is that a sacrifice had to be made to allow God to pass over the houses of those who believed in Him and spare them (Exodus 12:26–27). Remember that the Egyptians had been treating the Israelites badly for hundreds of years. Remember also that the pharaoh who ruled at the time of Moses’s birth actually ordered the killing of every Hebrew baby boy. Remember also that Pharaoh had been given many chances to know God and believe in His power. The fact was, the Egyptians were humans who made bad choices, and like all humans, their choices would eventually result in their deaths. If it had not been a plague, it might have been a battle. But whoever chose to oppose God was not going to win. Our sin always has consequences. Sometimes we experience the consequences directly, and sometimes consequences from our actions also fall on innocent people around us. When Pharaoh and other Egyptians chose to oppose God’s will, they (even if unknowingly) took on the consequences of that choice.

Ask someone who knows about baking to show you what yeast does to dough and to explain to you why, since the Israelites were in a hurry, they couldn’t add yeast to their dough.