Why is Faith so Important? (1 Corinthians 1:30; LD 23)

If we are really honest we must affirm that we struggle in our faith.  This means that there are times when our faith is strong, and there are times when our faith is not so strong.  In fact, we do not like to admit it, but we even sin.  We really do not like to admit it, but most of the time we enjoy our sin for a little while.  If we are so weak, and broken by our sin, then how can this weak faith be so necessary?  Should we trust in our faith or are we asking the wrong question?