The cache is not at the posted coordinates. You must complete the "Nashville's Oldest Churches" Adventure Lab to get clues to the final locaction. The "Difficulty" rating is based upon the fact you have to complete the Adventure Lab to make the grab, not for the hide itself.
The final coordinates are: N36 09.ABC W086 47.0DE.
Please be sure to put the cache back as you found it and make sure that the log stays hidden.
I hope you enjoy the Adventure Lab and learn more about these historic churches.