Just to clarify and expand my above point - I was saying that to suggest that without God, man has no purpose (or that life itself doesn't make sense) is incorrect.
Man does have a purpose – to procreate and continue the race. All of life is a struggle for survival and almost all fail. It is estimated that 99% of every species of every creature that has ever existed is now extinct. Just because man (and every other living thing) feels the need to continue the race does not imply the existence of a supreme deity.
Many variants of life exist on earth today without any purpose whatsoever other than to survive – the Ebola virus, Nematode worms, Mayflies, Lemurs, Snow Leopards, Man, etc.
Don't get me wrong; I don't want to see species become extinct. I think every animal and creature on this planet has as much right to be here as us, with the possible exception of the Ebola virus and Noel Edmonds.
But just because Man exists and has developed the mental capacity to ponder the possibility of a greater power does not mean there is a God.
In an effort to understand the world around him, man created the notion of 'God'.