Harrison K. Long
Explore Group Properties, Coldwell Banker Previews, Irvine, CA
If it is in Utah County - and it is an LDS Church building - it will have little or no effect, depending if it blocks any views. If not, my thoughts would be that it would slightly increase your property value, not decrease it.
I think there are many variables.
I would suggest talking with a local Realtor and asking them for their opinion. Depending upon what the church is doing, it may or may not change the value. The other side of the coin is, based on the zoning, what else could have been built there? In most cases a church will be one of the more positive improvements for the community and neighborhood.