In wiktionary.org theology is defined as "study of God", while in Microsoft's Encarta Dictionaries, it's defined as "study of Religion".
Can we use theology in terms of "study of religion"? I mean isn't it stemming from Greek theos meaning God?
When studying God, we don't necessarily study religion, do we? We study God's existence (not related to religion yet), we might study its attributes (still not related), and then we might study its products (now we're talking about religion).