Speak for yourself. That "we" is presumptuous.
The cause of the universe must itself be uncaused, or else it is only an intermediate cause that must itself refer ultimately to an uncaused cause. An infinite regress is impossible with respect to existence. Unlike causes per accidens which can in principle be infinite in length, a cause `per se` cannot; without a terminus, there would be nowhere from which the latter causes would derive their force, so to speak, like an arm pushing a stick that is pushing a rock that is pushing a leaf. Meaning, the cause is not some distant one in time, but one always acting; otherwise, everything would vanish. The only cause that could have this property is self-subsisting being.
From there, you can know quite a bit about what else must be true of self-subsisting being.
