The only way back is the way we came. Now...there are different methods of doing that, but at some point these methods merge.
Many of the methods attempted to merge back into God do not work because they were devised in a higher age and don't translate into this lower, totally physical age with it's shortened life span. Hatha yoga, and most other yogas, for example...
How about forgetting about finding 'God' by going backwards and/or travelling in ever decreasing circles.
Maybe 'Gods' intention is that we go forward under our own steam and our own self imposed morals and then, at some distant point, we may just find 'God' without ever having to have searched.