what goes around comes around, and that is the rule of the world, not just one faith.
Karma is the re-actions that the elements of physic have while interacting amongst itself.
The physical elements of physic are like inert/impersonal marbles [atoms] bouncing and re-bounding off each other. It is the persona that is present in the form of consciousness that brings animation to mundane material forms and inventions.
God is a persona with hios own birth-right as Godhead ---we are parts and parcel sparks of the Supreme Soul ---this is revealed in any honest Theistic & literal translation of the Bhagavad-gita as it is in the Gita's original purport.
So regardless of faith ---the karmic interaction of material elements of the cosmos are inert ---whereas the Conscious Spirit Soul is an individual indivisable Persona, but due to ego-conditioning along with the allure of base sensual-gratification, the soul is thinking They are the Pemporal Body & Ego ---so, at death, the final sentiments that well-up in the soon to pass lifetime, aspires to continue their unfinished unsatiated mundane/base/emphemeral desires; in lieu of un-alloyed devotional service(s) to Godhead.
Repeated births are subjective oblivion-istic surjourns through time and space and forms at the spped of whim bypassed by other overlapping whims in-ad-infinitum ---in the field of activities of relative (in-absolute) transient existence, like the adventures of "Gumby & Pokey'.
The catch is:
God is the Absolute. So absolute knowledge can ONLY be obtained by an unbroken chain of disciples that represent the absolute ---this 'rule of thumb' applies to all skill-sets and trade guilds ---knowledge must be past down from the absolute source. If such source is un-available. Then there is no means to get bonefide membership. The example is given:
"How does one know who there father really is? Ask your mother" ---this refers to how knowledge "desends". It is a mis-conception to think knowledge may be obtained by the "ascending prosess" ---we cannot self-generate knowledge by intellectual prowess.
All complex mechanisms are predicated upon the repeated super-imposition of the most basic mechanical laws. 2+2=4 for the poor and for the ultra rich.
Whether we use a can-opener or a construction-site crane: the rules of a "Mechanical Lever" operates by the same principles.
Whether we use a shoval or a construction-site bulldozer: the "Mechanical rules" are the same.