[BTS] The Spy Game

I recently attempted a game where I was going to use religion to influence the world and make good money founding religions.

I set the difficulty down so I had a better chance of founding as many as possible.

I found myself mid game not caring about spreading the numerous religions to my enemies but planning a massive artillery assault where I would capitulate the world by my military dominance.

Is this normal?

Secondly, what do you all think about Spies in lower levels like Noble? It seems to me not worth it because of the slow teching AI.