Question 3. The simplicity of God
Is God a simple or complex being?
The Catholic Church teaches that God is pure spirit. Ancient mythologies would picture their gods as immortal humans or animals. So, it is important to that those who believe in God understand what God is and is not, in order that they don't fall into the error of worshipping the creature instead of the Creator.
Catechism of the Catholic Church #43 Admittedly, in speaking about God like this, our language is using human modes of expression; nevertheless it really does attain to God himself, though unable to express him in his infinite simplicity. Likewise, we must recall that "between Creator and creature no similitude can be expressed without implying an even greater dissimilitude"; and that "concerning God, we cannot grasp what he is, but only what he is not, and how other beings stand in relation to him."