I believe in God because I think its the best explanation for the existence of our universe with it's laws. A being outside of our current space/time setting our universe into motion just makes sense to me.
Interesting, I've never heard of that term but I am partial towards the Maliki madhab which is highly influenced by the Asha'ri and I see them listed there.
If our universe requires a being outside it as an origin, why shouldn't that being itself require another being of even further outside as an origin, and so on?
Scientists believed this for the longest time, but I've recently seen a documentary explaining that, at the very bottom, there's a giant koala bear. Apparently they're still trying to determine why it's smiling.