Yes, God who is spirit is the mechanism.And there is a mechanism for a magic realm of spirits and immortal souls that both can and connot interact with matter and that there is an inexhaustible supply of these immortal souls just waiting to be plugged into every person that will be born?
And we already know that no 2 atoms are exactly alike even though you want to ignore that fact. So what makes atoms of the same element slightly different?
Since you think everyhting has to have a purpose, what is the "purpose" of that?
The purpose of mind creating a physical world is for us to share in his existence.