Let us look at the question from your point of view:
Let us assume that you have now 'returned' to God, and are looking at your former life of having been 'separated' from God.
We can call our new life with God 'the real', and our former 'separated' life 'the not-real', OK?
If our former life of separation were 'the real', there would be no point in seeking a 'return' to God.
So if our former life is 'not-real', then it must be fictional. The character in question who thought himself 'separate' never existed to begin with, so neither did his 'separation' from any God. The only thing that is real is this consciousness that is completely at one with God. There never was anything else; it was all a fiction, a dream, from which one has now awakened into the true state of reality. At no time during the dream were we ever separated from God; we only had a dream-thought that we were separate, and now we know that separation was only an illusion.
The fictional dream character does not return to anything; it only dissolves away. Why would it's fictional existence continue on into true reality? That would only be to perpetuate the fiction, and the suffering, and the delusion, and the self-seeking after God, Enlightenment, Heaven, etc.. Spiritual awakening brings all that to an end. We call this end, or 'extinguishing' of the self, Nirvana.
Note: To add one more tradition to ben d's list, there is Buddhism. The Buddha said that all things have 'Buddha-nature'.