Two huge differences between pantheism and atheism
a) Pantheists believe that the universe is ordered, orderly, and also conscious, and therefore we are evolving spiritually as part of that all-conscious beingness that is known as God. The consensus among atheists is that the universe is accidental or random, and that natural laws occur outside of any controlling force
b) Atheists deny that we have a spiritual nature; because along with the pantheistic view of God as immanent is another belief that the human soul is immortal - therefore most pantheists believe also in reincarnation. Atheists do not believe in a human spiritual nature or "essence" - the most famous statement of atheistic philosophy being "existence precedes essence" or Rand's objectivist claim " existence is."
So there are two huge differences between atheism and pantheism.
Pantheism is a first cousin to panentheism, which also believes in a non-theistic Deity:
Reality exists.
We, you and I, exist within reality.
Reality had a beginning.
The beginning was initiated by a creative force.
Reality exists within the force that created reality.
Reality coexists with its creative force for a reason.
Reality depends on its creative force for continuation.
The creative force depends upon the reality it created as a place to travel, to learn, to create, to expand upon its omnipotence, omnipresence, and omniscience.
The creative force travels reality in many forms, one of which is within you as the soul.
You are a piece of God and deserve, must demand, to be treated with the appropriate respect as you travel reality, life.
Everyone is a piece of God and deserves, must demand, to be treated with the appropriate respect as they travel reality.
You must treat everyone with the appropriate respect as they travel reality for they are a piece of God.
You must demand everyone around you be treated with appro-priate respect as they travel reality.
You will return from whence you came carrying with you the results of your travels.
You will experience for eternity the pleasant warmth or painful fire of the knowledge and worse yet, the full empathy, of the direct and indirect results of your travels through reality or what is called the ripple effect of your life.
Lots more about panentheism via Google, but that's a pretty good list of principles.