Fossil fuels may not represent fossils and in any case, their age is unknown. Coal certainly can come from plant material, but it may not need hundreds of millions of years to form.
Protonic matter may and does eventually, decay to neutrons. Thus N14 becomes C14. The process may be accomplished by electromagnetism which may be sourced by lightning strikes or other means. Not everything in the history we call the bible is a fantasy, and not every interpretation is true. Calling a book Genesis may be a lie! It may merely describe events seen by humans. The question then becomes, what events and when?