I agree with other posters: When I first looked at this it felt more like a NASA program than a Church organization. If they want something futuristic then this might work, have you given them this draft yet?
Something about the way that you've set up the a's in America, slanting in towards one another, along with the braces of the larger M shape, make me feel claustrophobic. It's as if this mission is going to dominate me and collapse/trap me inside. While to a certain extent this is good if you want to make people feel included, it might give off a authoritarian vibe that some of America doesn't respond well to.
Also, when I zoomed the image out, to a small size as it might appear on a business card (top right, with name and contact in the center), a lot was lost in the "Missions America" text. It started to become too busy in my opinion.
Have you considered making the A in the "MA" more prominent? Perhaps you could combine them to make a cross shape, giving it a bit more definition to the organization. It's a little bit conventional, but with your fonts you might be able to make this work. See the attached image as a sketch.
Good luck!