"Pray tell sharp, just what molecules can come about except as results of other chemical exchanges?
"We will start off real simple, H and O2 for starters
Are you sure you want to do this?
Where did I claim that molecules come about by anything other than chemical reactions?
No, the question is do you. I shan't embarrass you by leading your hand. Here is your statement again.
Abiogensis does not require that a modern cell spontaneously arise, what it does require is an imperfectly self replicating molecule subject to some time consistent selection, even remotely.
Okay.., here.., Take any molecule H2O or any other molecule you might choose, or any imaginary mythical molecule which may have existed in the past. And using your statement there, demonstrate the veracity of your assertion.
Here is a Wikipedia version of the Classic definition
"A chemical reaction is a process that results in the interconversion of chemical substances.[1] The substance or substances initially involved in a chemical reaction are called reactants. Chemical reactions are usually characterized by a chemical change, and they yield one or more products which are, in general, different from the reactants. Classically, chemical reactions encompass changes that strictly involve the motion of electrons in the forming and breaking of chemical bonds, although the general concept of a chemical reaction, in particular the notion of a chemical equation, is applicable to transformations of elementary particles, as well as nuclear reactions"