4. Since God is the Creator of humanity, is He also the Creator of evil?

No. Scripture says God is holy (Isaiah 6:3) and by nature perfect and upright (Deuteronomy 32:4); therefore, He cannot be the originator of evil.JTL13 3.6

Rebellion marred the perfect atmosphere of heaven when Lucifer, a high-ranking created being in heaven, began to covet God’s place. In an attempt to take control of the universe, this fallen angel sowed seeds of discontent and jealousy among his fellow angels. He required their complete allegiance. The resulting heavenly conflict ended when Lucifer (Satan) and his angels were expelled out of heaven (Isaiah 14:12-15; Ezekiel 28:12-19; Revelation 12:4). JTL13 3.7

(See also My Journey to Life: Step 15 - The Great Controversy.)JTL13 3.8

Sin originated in humanity when Lucifer, now known as Satan, directed his entire legion of evil towards God’s newly created Planet Earth. Despite living in a perfect world, loved, and cared for tenderly by their Creator, Adam and Eve fell prey to the enticements of Satan in the guise of a serpent. They allowed doubts about God’s word to take root and chose sin above obedience.JTL13 3.9