I suggest you to repost your question in the official forums because the local forum is heavy wiki related. Therefor you'll get a faster and more valuable answer over there.
Afaik, you settle next to the enemy shrine, build up your city consisting only of farms and cottages and send in all the support you've got. If everything is ready, wait for an enlightment to happen and right before the time runs out, build the castle. You might get the enlightment, but you'll have a bunch of incoming attacks as well. So be prepared