Just because you have agnostic tendencies on organized Christian religion, is by no means to be interpreted as a construct in those of uuse who believe such that we are not Christians. It has been my experiance that quite the opposite is true in reality.
I'll save everyone here the bible quotes, but I will not spare the meaning of such. Man's purpose in life is to help his fellow man. In doing so, It will not only change you as a man, it will lead you to God. It is the natural coarse of just the ways thing work out.
But it requires a rational being to do such. The war of the left is not just on Christianity, its target is a war on rational thinking. here very thing that Christianity has promotes as a tenet.