What was required in order for life to originate on Earth from nonliving molecules?

In my opinion, the question is in error.

1) How would you define the idea "life", and how would you define the idea "nonliving" ?

2) You state, that "life" on Earth originated from "nonliving" molecules. Are you sure that is the case ? Maybe if you substitute the words in double quotes by the definitions you gave as the answers on question #1, you may see that the distinction you thought, is not according the reality, but just a fallacy.

What if every molecule, or even every particle, is like a building_block of which Life is made of ?

What do you think about the axioma or statement: "In Life, Only Life Exists" ?