Oh Weelll, here it comes.
Remember, Satan is God’s own creation.
If you believe, as I do, that God is an omnipotent power, then you have to believe that evil only exists within God’s sphere, because He allows it.
In other words, the “evil” we experience is of God’s own making. Hard to understand, but God is the ALPHA AND THE OMEGA, THE BEGINNING AND THE END.
Satan exists only because God allows him.
And it may not be “evil”, but just unpleasant.
I don’t get in to deep religious discussions. For one thing I am unqualified . For another there is never a winner, because basically it is an argument over conviction and beliefs.