Every song has a composer every book has an author every car has a maker every painting has a painter and every building has a builder. So it isn't irrational to take this simple logic a little further and say that nature must have had a Maker. It would be irrational to believe that it made itself.
My principal motivation is supporting my family which is not a bad reason for getting up in the morning. That's always been my motivation - to take care of the people who rely on me.