Outreach is a great responsive church theme from StudioPress. Built to be customized. As with all StudioPress themes its more of a framework to make a unique looking site with all the features you need.
You can check out or purchase the theme over at StudioPress
StudioPressis one of the better-known theme developer on the block. They have a number of responsive WordPress themes built with their own framework Genesis. We have a sister blog to this site that uses one of their themes, and I have to say they’re quite nice.
StudioPress themes are a little more pricey than some of the themes out there but they come with some nice features. Individual themes are $99 dollars although you can get special pricing after purchasing your first theme, which comes with the Genesis framework. To purchase all of their themes with a lifetime deal it is $395, which is pricey but if you plan on running a professional blog(s) it tends to be worth it.