Those are open ended question or conundrums that perhaps faith tries to answer but science does not. Can we or our language really comprehend infinity or the vastness of space or First Cause (outside of faith or generally speaking)?
No. Our brains are capable of understanding anything if given time. The questions you said already have a decent answer.<br />
1) there is no purpose.<br />
2) your parents made you and it goes back like that for many generations until we reach a point where we reproduced asexually until we reach a point where we are nothing but complex proteins.
If you give me a week then I might be able to collect all the files I have. (Chances are good that I won't do it)
Those proteins are formed from amino acids in chains, those amino acids are made from an assortment of atoms and the elements are made in the deep reaches of stars that were made by nuclear fusion. There is no objective reason for this, it's just the forces of nature acting how they normally act
Have you not read any standard science book?
our brain can comprehend a lot, and it's growing. the only time it stops is when people ignore what makes them uncomfortable.
what my mind cannot give me, my soul provides; its in my soul that I can comprehend everything about this universe and why things exist as they are.