I am a skeptics and your explanation is not even close to makes sense (based on logical argument), because the logical fallacy in your arguments is Appeal to Tradition, wrong conclusion from previous premises based on how long or old it is, something like this:
1. X is old or traditional
2. Therefore X is correct or better.
You should have a better logical arguments when talk to skeptics, which is useless if you bring your Creator or divine being on an arguments, don’t get me wrong, I support fasting with my own reason (I wanna diet).