"come into being somehow"
That phrase implies a time before which they did not exist, i.e. (3d analogy again) a height below the center of the earth, i.e. a nonsensical requirement that has nothing to do with the mathematics.
No it implies something outside time either the universe has existed forever or it has an origin which is caused somehow you have not refuted this conclusively. IF the universe is eternal THEN it simply is and has no cause. IF the universe and spacetime originated at some point THEN something must have caused it thus the chain of cause and effect must go back to an uncaused cause. You have not refuted these two statements.