Christopher Hitchens said that the fine tuning argument was the most persuasive argument for the existence of God that he had heard. The universe seems like it was designed for life to inhabit it and not a random throw of the dice.
Can you imagine getting zero every time you spun the roulette wheel? The chances of that are better that the universe coming together randomly.
Graham Veal of Saints and Skeptics sums it up in twelve points here:
What is the Fine Tuning Argument? 12 Quick Points
1) Scientists have increasingly become aware that the universe is ‘just right’ for life. If any one of a number of features of the universe had been even slightly different, life as we know it would be impossible.