What is the theme of the Nigerian folk tale titled "blaming it on Adam

The theme of the story is that we should not blame others for our lives and choices, especially considering it might turn out we would do the same in their shoes.

Iyapo was blaming his fate on Adam, but once he was given the opportunity for a good life without the survival struggle he also fell under the temptation of curiosity. Just like Adam ate forbidden fruit and lost a chance to stay in the Garden of Eden, Iyapo opened the door King told him not to and lost the chance to stay in the palace as his brother.

It was his own choice and he knew it is forbidden, even though before he blamed Adam for a similar situation.

The story, therefore, talks about how we each make our own choices and that we should answer ourselves for them.