> How does Pantheism help you grow Spiritually, day
> by day? What are the guidelines, milestones? How
> do you feel and assess that growth?
Very stimulating question!
First and foremost, the central problem that I identify in (most) religion is that it is based on the premise that man is a metaphysically broken creature that requires salvation/redemption/liberation. That is the central error upon which the "sales pitch" relies.
Realising that I am not fundamentally broken, I do however realise that I am flawed and that my beliefs have a huge impact on my behaviour.
With pantheism and non-duality there is a state of mind where you look at other people (and all life) and view them as God playing "let's pretend" as a human - or God dreaming the human dream. Loving others comes more easily, as does letting go of resentments. Life has a playfulness about it, so our personal dramas become less important. Instead of seeing myself as a detached ego with a fierce will to survive beyond death, I'm able to hold my personal identity more lightly, recognising that fundamentally I'm God/Universe, and God/Universe is playing all the parts. So I, as God, am playing all the parts, only each part doesn't experience what the other parts are experiencing - that's the nature of the aperture we call consciousness.
The worst thing in my life is that I'm striving to overcome half a lifetime of bad habits that have accumulated as a result of bad thinking and poor decision-making. I care a great deal about being a moral person, not because of future reward, but because bad morals poison my life right now and cause me misery. And right now is all anyone has - an eternal now (in that detached sense of playing all the parts).
Now, I have to add a paradox here. I'm still something of a misanthrope. I have great love for some people, but for the larger morass of humanity, I experience plenty of suspicion and contempt. But this is tempered by pity, as I view them as God getting completely lost in the game. And I recognise that life is naturally tribal.
Regardless of the fundamental nature of reality, the lion belongs in a particular pride. He chases the gazelle, while the gazelle runs from the lion. I have to destroy life (eating), so that I can live. There may even come a time when I have to kill a person to save another person's life. So I'm highly critical of spiritual teachers who are into universal love, pacifism, freedom from suffering, transcending fear, etc. All unrealistic nonsense. My spirituality is deeply grounded in facing the harsh realities of life.
Then there is the ecological side of pantheism. There is no separation between organism and environment, so it makes no sense to poison your wider body (the world).