The reason theism took off is because people DIDN'T have the answer to Life, The Universe and Everything. So some wise guy invented God and had his God create everything, which then made things orderly. It gave his life and everyones' life shape, form and finality. "God did it."

Nowadays we have much more knowledge of how we came to be here. Not - by any means - ALL the answers, but enough answers to enable us to realise that such talk of "God did it." is utter rubbish. One day this will become a popular reasoning and gods will dissipate into the ether where they are supposed to exist. Now THAT'S a paradox.