The Allbeing is the name applied to the Being Formerly Known as God, who may or may not have created the Universe, who may or may not still be intimately involved with his Creation, and who may or may not be All-Knowing and All-Powerful.
Got that? Good.
There is much debate among the various religious faiths over the precise nature of the Allbeing, but there is wide Consensus that He exists, although paradoxically, evidence for his existence is revealed only after one embraces the fact of his existence.
For more information, pray.