4:4 Who is the God of this world?

World here (KJV), means age, which refers to the current evil age with its cares, temptations and desires, both moral and physical. The god of this age is Satan (CP Jn 12:31; 14:30; 16:11).

Paul is not referring to Satan in 2Cor 4:4 as a god in the sense he is a deity, but because he is the one who controls unbelievers, and is the one they serve, whether they know it or not (CP Jn 8:44; Ro 6:16; Eph 2:2; 1Jn 3:8).