I know I am not sufficiently qualified to critique your image, but I too like architectural subjects.
I have found out that depending upon from where you take the photograph, determines the exageration of the converging verticals.
I have also determined that I am better standing pretting well square on to a building (if it is symmetrical). If there are converging verticals you can then straighten them in Photoshop.
You say you used flash. I don't think that would have had advantage or disadvantage, as you are so far away. I am sure someone will say whether or not I am right in this case.
I think what you think is the result of flash is the burning out of the sky and I believe this may be because you are focusing on the church. If you had focused on the sky, there would be more detail and the church would be darker.
Some clever people (not in a car
), would make a decision to photograph an object (say this church) - take a tripod, focus on the sky and take a photograph, and then move the focus point (without moving the position of the camera) and then take a photo of the church.
They would then download both images and blend them in PS - perhaps HDR but I am not really sure about this as I have never done it.
The theory sounds good and I am always going to try it. I'll let you know when I do.
The lighting on your church is wonderful and it is just catching the trees. I'd be inclined to straighten, crop and try the curve tool on it.
Now I have done that I am not sure it is an improvement.