God most certainly did not create Satan’s evil ways as an evil thing to plague the human race, as you incorrectly suppose. Satan was originally created with all beauty, but Satan was puffed up with pride and sinned. The same sort of pride that the Roman church posseses in their claim to only have all the truth of Christ. Wrong presupposition! In Christ Grace Believers and Calvinist believers have the correct Biblical teaching directly by the Holy Ghost/Spirit. Not by presuppositions of the traditions of men, which Christ Jesus warned against, and Rome continues to ignore.
Our God is all powerful and all seeing. IOW, God knew what Satan would do from before creation and created him anyway.