With respect for everyones opinions, I have to weigh in on this.

Of course 'truth' is a shifting target when attached to nothing, defined by nothing, and subject to nothing other than the whims of the day. How would you know if you found it? What is 'it' anyway; a collection of current opinions? Of what value is 'truth' like that when life's crisis strike?

For me and many like me, your question has already been answered and the answer has withstood fire, sword, and the test of time:

"Seek ye first the Kingdom of God and His rightousness..."

http://www.youtube.com/watch?v=fH8bV7rUVaU&feature=related

Flaws and all and regardless of the tradition chosen, these truths provide the bedrock for everything else. There is no substitute in what is offered by secular humanists.