Thanks for writing in!
Your site is using Icon stack. The church demo content on the other hand is using Renew stack. Simply go to X > Theme Options > Stack and switch it to the very same stack used in the Church demo.
The big hero image at the very top is a Revolution slider. Please check out this article to know how you can integrate sliders above or below the masthead. Check it here: https://theme.co/apex/forum/t/features-sliders/97
The rest of the page and its contents were built and edited with Cornerstone.
Hope this helps. Please let us know how it goes.