You drawn a wrong conclusion about God having created Satan to be evil.
In the following, the king of Tyrus (rock) is put as symbolic for Satan himself...
Ezek 28:12-19
12 Son of man, take up a lamentation upon the king of Tyrus, and say unto him, "Thus saith the Lord GOD; Thou sealest up the sum, full of wisdom, and perfect in beauty.
13 Thou hast been in Eden the garden of God; every precious stone was thy covering, the sardius, topaz, and the diamond, the beryl, the onyx, and the jasper, the sapphire, the emerald, and the carbuncle, and gold: the workmanship of thy tabrets and of thy pipes was prepared in thee in the day that thou wast created.
14 Thou art the anointed cherub that covereth; and I have set thee so: thou wast upon the holy mountain of God; thou hast walked up and down in the midst of the stones of fire.
15 Thou wast perfect in thy ways from the day that thou wast created, till iniquity was found in thee.
Per those verses in red, God is not talking about the flesh king of Tyrus. He is pointing directly to Satan, originally an "anointed cherub". A cherub is a Heavenly created being, not a flesh being. And God shows there that cherub was originally in His Garden of Eden. No flesh king of Tyrus ever as been in Eden, so that's yet another way here we know God is merely using the "king of Tyrus" as a symbol for Satan. (also, the word Tyrus means 'rock'; per Deut.32:31, the little "rock" is pointing to Satan. God is our ROCK.)
God says there He originally created Satan perfect in his ways. So NO, God did not originally created evil nor darkness, Satan did when iniquity was found in him.
16 By the multitude of thy merchandise they have filled the midst of thee with violence, and thou hast sinned: therefore I will cast thee as profane out of the mountain of God: and I will destroy thee, O covering cherub, from the midst of the stones of fire.
17 Thine heart was lifted up because of thy beauty, thou hast corrupted thy wisdom by reason of thy brightness: I will cast thee to the ground, I will lay thee before kings, that they may behold thee.
18 Thou hast defiled thy sanctuaries by the multitude of thine iniquities, by the iniquity of thy traffick; therefore will I bring forth a fire from the midst of thee, it shall devour thee, and I will bring thee to ashes upon the earth in the sight of all them that behold thee.
19 All they that know thee among the people shall be astonished at thee: thou shalt be a terror, and never shalt thou be any more.
KJV
That pronounced sentence of destruction by God in the fire, is also another way to know He is pointing to Satan. It's because no flesh king has been judged and sentenced to perish by fire in the future yet. But Satan and his angels already have been judged and sentenced to perish in the future "lake of fire".