It is said that the closer we are to God, the more we love Him and worship Him, the more we pray, the harder the devil works to derail us and to take us away from God.
Because that is exactly the devil’s job. He exists all right. He is a spirit. Very much like the angels are spirits. Very much like our souls are spirits; and we live on after we die. The devil too is a spirit. He is an evil spirit; a malevolent spirit, whose job, as I said, is to take us away from God.