>>472029>1. Nothing that is contingent is contingent upon itself, that is, it is contingent upon something other than itself.>2. The material world itself is contingent. It began at a finite point in time.>3. Therefore, the material world is contingent upon something other than itself.Nice try, but this is just a variation of an old trick. You are basically just trying to trap somebody in a mental cascade, a infinite regression loop they can't get out off. Like the old "it's turtles all the way down".
If you care about the origin of reality, the atomist model is pretty decent. It stars with the void which is the absence of everything, not just matter but also space-time and what ever reality might exist beyond/below that. Like you said
nothing is contingent upon itself.
The void is also perfect order with zero entropy. But entropy must increase and that means the perfectly ordered void decays into a more disordered reality that has messy stuff in it. In case you are tempted to question where entropy comes from. Consider that Entropy could just be described as the absence of everlasting things. The only way you'd get that was if change was impossible, but change clearly is.
There you have it, a fully material world without any need to invent idealist stuff to bootstrap it.