Plant Spirit Wisdom: Shamans and Sin Eaters

I'm probably not the ideal reviewer for this book, so please bear that in mind. Some of our shamanic members had a go a it, and couldn't get on with it, which is why its come to me. It took me a few pages to realise what the issues are. Heaven's language is rather monotheistic. He talks of 'God'. Sin Eating is also a Christian notion, and a slightly odd one at that. I was previously aware of a tradition in which poor people were paid to eat a meal for the dead, and take on their sins, thus freeing the deceased for the afterlife. The ideas of 'sin eating' in this book are different. More subtle, with a different take on what 'sin' means. I'm not sure that the term 'sin eating' is remotely helpful in the context of Heaven's writings, and may in fact be misleading. The other issue to flag up is that the language is heavily gendered.
 
What this book does, is explore the idea of working in a rather shamanic style, with plants. However, it places this practice in the context of Celtic Christian belief, and especially Welsh folk tradition and magic. As such, is very interesting. Although I wasn't reading it with a view to undertaking any of the ideas suggested, I feel I have learned a few useful things, and been given some productive ideas to consider.
 
For a person of the right background interested in working shamanically with plant spirits, this would (I think, but I am no expert) make a good enough place to start. It's also the first book I've read to give me a sense of how Christian Druidry might work, so it was rather interesting in that regard too.