The Easter Lamb artfully represents the connections between Passover and Easter and why both events hold significance. You don’t often see this type of connection in a children’s book, so kudos to the author for this effort in helping children see Easter firmly rooted in biblical and theological tradition.
The text complexity and illustrations are excellent for an early-mid elementary audience, and the book can make for a good read-aloud. Thematically, though, this is too advanced for the younger crowd (especially 4 to 5-year-olds, as the book advertises itself as being for).
Several theological aspects of the book (sin, atonement, resurrection) are assumed to be, at least, generally understood by the audience and receive little explanation, so this book is best for children already familiar with the stories who are ready to make the deeper connections regarding the allegory of Jesus as a lamb. Even older children, without background knowledge of the stories, would likely struggle to make the necessary connections based on this book alone.
Another consideration for younger audiences is the more violent aspects of the stories. Of course - there’s no shying away from the fact that if you want to teach a child the meaning of the “blood of the Lamb,” you must do more than tell cutesy stories. Still, I’d recommend reading this book between parent and child, especially for the youngest readers.
It didn’t escape the notice of my six-year-old, for example, that the sweet little lamb in the illustrations in the first few pages suddenly disappears when God tells the Israelites to slaughter a lamb to eat. Thankfully, dear reader, the lamb comes back on later pages.
Overall, this is a decent attempt at building an allegorical understanding of the connections between Passover and Easter in children. Further exposition around some vocabulary terms would be helpful for younger readers. Sin, for example, is described as a monster that follows the Israelites around and also lives inside them. In the final pages of the book, the reader is reminded of their sin and compared to Pharoah, who, just a few pages earlier, was enslaving and mistreating Israelites.
Concepts like those above, especially for our literal-thinking young readers, need more than cursory explanation, and elements like this are what holds the book back from being understandable and relatable for most children.