It is a sin to lie to your children by trying to get them to believe in mythological stories that involve magic and pagan ideas.
It is a great idea to teach your children about the real-life-but-long-gone "Saint" Nicholas of Smyrna, a bishop in 4th Century Turkey who expressed his Christian agape love for children and the poor, but who also used his authority to order the destruction of local pagan idols and institutions, including the local Temple of Artemis, which was razed to the ground on his orders. They then used those materials to build new churches, redeeming what was used for evil to bring about good.
He was a loving and compassionate man who worked hard to care for children and the poor, and who also harshly rebuked wickedness in his day. Today, he is an example for us in this way. Don't teach your children mythological lies about magic and and the supernatural, which may harm their faith someday (it certainly harmed my own, as it has many others'). Instead, raise your children up in the truth and in the teaching of the Bible.
Now this I can appreciate! :thumb: