Ok, so the next question would be, why does God require such strict measures? Cleanliness and 'wholeness' are obviously recommended for personal wellbeing but why or how would being un-whole or unclean affect one's worship?
As I said in my last post, I don't know if the restrictions came from God or not. And I don't know if any of the conditions that would render one as unclean would negatively affect one's worship. To the best of my knowledge, the Jewish restrictions do not prevent somebody from praying or worshiping; they were primarily concerned with Temple rituals.