What is the difference between the personality of a Muslim child and a non-Muslim child?

There is no difference between a Muslim child and a non-Muslim child in that both are born upon fitra (natural inclination) and the pen is lifted from them, due to the Prophet's (peace be upon him) saying: "Every child is born upon fitra, then his parents make him a Jew, a Christian, or a Magian," and his (peace be upon him) saying: "The pen is lifted from three: from the sleeper until he awakens, from the child until he reaches puberty, and from the insane person until he recovers or regains his sanity."

As for upbringing and education, a Muslim child is raised on the ethics and acts of worship of Islam, due to his (peace be upon him) saying: "Command your children to pray when they are seven years old, and beat them for it when they are ten, and separate them in their beds," whereas a non-Muslim child is raised on polytheism and sins according to his parents' upbringing.