We dont know whether the universe is finite or infinite or not , to accept either is to give us a a paradox. You correctly identify th paradox that leads when we consider the universe is infinite, but you ingore the one that gives us a finite universe. Even if you accept the universe is finite, why would that let you imply its cause is a personal being? your just assuming that.
origins.org/articles/craig_existencegodbeginning.html]The Existence of God and the Beginning of the Universe
In fact, I think that it can be plausibly argued that the cause of the universe must be a personal Creator. For how else could a temporal effect arise from an eternal cause? If the cause were simply a mechanically operating set of necessary and sufficient conditions existing from eternity, then why would not the effect also exist from eternity? For example, if the cause of water's being frozen is the temperature's being below zero degrees, then if the temperature were below zero degrees from eternity, then any water present would be frozen from eternity. The only way to have an eternal cause but a temporal effect would seem to be if the cause is a personal agent who freely chooses to create an effect in time. For example, a man sitting from eternity may will to stand up; hence, a temporal effect may arise from an eternally existing agent. Indeed, the agent may will from eternity to create a temporal effect, so that no change in the agent need be conceived. Thus, we are brought not merely to the first cause of the universe, but to its personal Creator.