Well, yes, the universe has a beginning but there is no point before beginning. Having a beginning doesn’t necessary means that the universe has to come into existence.
The fact that the universe has a beginning does mean that it began to exist. The beginning is just a starting point. That is it.
That is something we can conclude. We however cannot exclude God and creation which means that we have two options: One with God, the act of creation on nothing which it has to be something and one without God as it is illustrated in OP.
That is another topic. I have another thread on this topic
here. There, I discuss whether God can decide on act of creation or not. The conclusion to my understanding is that God cannot decide since He is pure act and has no potentiality in His mind. That is true because one needs options in its mind in order to decide and options are potential where God cannot have. God by definition is creator hence the act of creation is necessary considering the fact that the universe exists and the fact that He cannot decide.