Today I am enjoying some quiet time at home reading. I finished a book I had started last summer: Timeless Wisdom of the Celts by Steve Eddy and Claire Hamilton. It is a brief, easy to read book. It gives the basic concepts of druidry, and may be a good starting point, but to really get into historically accurate information, additional reading is necessary (such as books by Ronald Hutton).
One thing that I found interesting was that it said that the first monastery in Britain was founded by Ninian, and that Ninian's view was "to perceive the eternal word of God reflected in every plant and insect, every bird and animal, and every man and woman."
That sounds like pantheism to me.