Yes, Satan is real. If we believe that God is real, we should also believe that Satan exists in another world under us.
According to Catholicism, they say that Satan only exists because God allows him to (The Catechism of the Catholic Church, paragraph 395).
According to Christianity, Satan is the epitome and embodiment of all evil things, described as “the father of all lies” in the Catholic Church’s Catechism (paragraph 391). It is his works that tempt humans into doing bad deeds. If something evil occurs, we can be assured that Satan had something to do with it.
Historic Baptists believe in the literal reality and actual personality of Satan (Job 1:6-12; 2:1-7; Matt. 4:1-11; etc.). In other words, they believe that the one referred to in the Bible as the devil or Satan is a real person, though they certainly do not perceive him as the caricatured red figure with horns, a long tail, and a pitchfork.
Satan is the adversary of God. Thus, Satan is evil personified. Many followers of the Bible consider Satan to be a real being, a spirit created by God. Satan and the other spirits who followed him rebelled against God. They were allegedly cast out from Heaven by their Creator. Theologians might speculate as to why the Almighty did not annihilate the “fallen angels,” as He is said to have done to his other creations when they failed to be righteous (save Noah and his family, of course). Satan was allowed to set up his own kingdom in Hell and to send out devils to prowl the earth for converts. The demonic world seems to have been allowed to exist for one purpose only: to tempt humans to turn away from God. Why God would allow Satan to do this is explained in the Book of Job, where Satan is described as an angel who works in cahoots with God. When Job asks why God let Satan torment him the answer is blunt and final: Hath thou an arm like the Lord? The story of Job is interpreted in many different ways by theologians but my interpretation is that nobody knows why God lets Satan live and torment us. God is God and can do whatever He wants. Ours is not to question why, ours is but to do and die.
BUT WHAT DOES SATAN REALLY LOOKS LIKE??
No one knows what Satan looks like. It’s up to us to decide if he is an immortal with a head of a goat or just a human just like us, but pure evil or maybe, worst.
Below are some pictures I gathered during my research. Just choose which photo you are convinced that Satan really looks like this.