Hi Enderfay,

I suspect that the first thing to do is to look at the history not only of the church (when it was established) but also to use the various archaeological tools that are available.
You can date a settlement back to the Domesday book, Magic map will give you some idea if there is any prehistory in the area, its all down to fine tuning, reading local histories and the local archaeology society.
It looks like a prehistoric stone set up in a church, but the 19th century vicars were always messing around with the past..
As for vibes, graveyards are spooky enough places anyway ;)