This discussion is still going on? Bloody hell lads. Go on a binge of Christopher Hitchens; he has long since dealt with these ruddy arguments fo' theism.
And to touch on the whole "Without Yahweh, life is meaningless" nonsense:
It's the opposite; with Yahweh, life is meaningless. If Yahweh were to exist, according to the Bible, we're all just pawns in his cosmic plan; we're no more than just biological machines with the illusion of existence and free will, whilst we are operated by Yahweh.
And it's the theists that believe this life, the only one we got, is just a farce; the real fun starts once they die and ascend to heaven for all of eternity.
When it comes to the meaning of life, it's what you make of it. Do you rescue sex slaves of Mauritania? Then that's the meaning of your life; freeing captives. Do you construct social and economical foundations to ensure the livelihood of the coming generation? Then that's the meaning of your life; attempting to make a better society. Etc.