Half banana said: The fungus apparently smoulders for a long period of time and with suitable kindling and blowing upon can be readily revived.
This is correct. They were able to transport fire for days. This will still work today too. The Amadou mushroom can also be used to create useful objects. Paul Stamets' hat is made from this mushroom.
Half banana said: BUT................. Abraham and Isaac are just fictional characters..................................
While this is quite likely, I, as I assume you do too, prefer to live in an evidence based world. I find it rather interesting to learn about ancient techniques and knowledge that are useful and that work. The Bible lacks a lot of this information.