Isaiah 45:4

Second, God chose to use Cyrus for the sake of the Israelites, so He might fulfill His promises to them. It was Yahweh’s choice of him that had resulted in Cyrus’ honorific titles (Shepherd, Isaiah 44:28, and Anointed, Isaiah 45:1). People do not have to be believers in Him for God to use them and bless them. The choice is His; He is sovereign.