you need a flyer to touch the church.. if you can't get it high, fly low, fly fast, when you're almost to the church drop the bomb, you can see the round targeter on it usually when you press the bomb button when the round target is on your target it'll hit.

Or... well you can fly high up above the church the fly straight down and dive bomb them. Works well iwth actual bombs in mission 2, don't know how well with the flyers.