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Nice clean design. Easy to navigate. Engaging color scheme. Serves your purpose well!
Couple ideas:
Add your church name or logo to the design. This could be done really small somewhere if you don't want the tail to wag the dog (maybe under the "Life Groups" logo in the green box, or above the green box).
Your "doing life together" idea is good, but maybe could be integrated into your photo area (maybe as an overlay). This would buy you extra space below, so that people won't have to scroll as much.
I'm not sure why you've added the large gray box at the bottom. It appears that the sub-text items are the same that people would find once they click on your large colored buttons (I'm assuming they are clickable!). My suggestion would be to simply add a fourth button (for HOME) along with the three bright ones you already have...and cut the gray bar out of the design entirely.
Hope that helps!

Great feedback Tim. I'm in the process of reworking this design a bit. I will definitely try to work in some of those suggestions. Thanks for your time!