Do Christians sin ? ABSOLUTELY, page-281

Satan?

The variety of beliefs among religious groups throughout history is only equaled by the diversity of these groups, even for those who claim to believe in the one true and unique God.

Not all religious groups assign a great deal of importance to Satan, created by God, as some of the modern day (since sometime in the 19th century) ones do.

So who or what is Satan? Reference: Satan

Satan,^[a] also known as the Devil, is an entity in the Abrahamic religions that seduces humans into sin or falsehood. In Christianity and Islam, he is usually seen as either a fallen angel or a jinn, who used to possess great piety and beauty, but rebelled against God, who nevertheless allows him temporary power over the fallen world and a host of demons. In Judaism, Satan is typically regarded as a metaphor for the yetzer hara, or "evil inclination", or as an agent subservient to God.

Even within Christianity there is no consistency in the belief in Satan.

In Christianity, Satan is also known as the Devil and, although the Book of Genesis does not mention him, he is often identified as the serpent in the Garden of Eden. In the Middle Ages, Satan played a minimal role in Christian theology and was used as a comic relief figure in mystery plays. During the early modern period, Satan's significance greatly increased as beliefs such as demonic possession and witchcraft became more prevalent. During the Age of Enlightenment, belief in the existence of Satan became harshly criticized. Nonetheless, belief in Satan has persisted, particularly in the Americas. In the Quran, Shaitan, also known as Iblis, is an entity made of fire who was cast out of Heaven because he refused to bow before the newly-created Adam and incites humans to sin by infecting their minds with waswās ("evil suggestions"). Although Satan is generally viewed as evil, some groups have very different beliefs

In Judaism.

Most Jews do not believe in the existence of a supernatural omnimalevolent figure.[48] Traditionalists and philosophers in medieval Judaism adhered to rational theology, rejecting any belief in rebel or fallen angels, and viewing evil as abstract.[49] The Rabbis usually interpreted the word satan as it is used in the Tanakh as referring strictly to human adversaries[50] and rejected all of the Enochian writings mentioning Satan as a literal, heavenly figure from the Biblical canon, making every attempt to root them out.[31] Nonetheless, the word satan has occasionally been metaphorically applied to evil influences,[51] such as the Jewish exegesis of the yetzer hara ("evil inclination") mentioned in Genesis 6:5.[52]

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That's just a sample.
Who or what is Satan?
Take your pick - whatever floats your boat.