Well, going back to the first post, which is supposed to set the scene for the thread:
So, how do you atheists, explain all these above?
I have had a experience that I'd describe as meeting God (it was not a near-death experience)
I've met anime characters and characters from novels in my dreams, but that doesn't mean they exist. If you've been thinking about something a lot, you can have a dream or sometimes even an image of it whilst awake (I usually get these when I'm tired).
but even without it I wouldn't be able to understand how you think you're alone in the universe.
I'm not "alone". There are many other human beings on this earth with me. Billions. All of them just as capable of perception, intelligence and emotion as I am.
Everything is so perfect,
But it isn't though, is it? If life were perfect then everyone would get an equal chance in life, but they don't. Some people are born into rich families and get whatever they want, while others inherit horrible genetic diseases that kill them quickly. The same goes in nature too - why would a benevolent God create a world which had a worm that lived by burrowing through childrens' eyeballs?
there's a reason for everything
Well, no, there isn't. If I throw a dice and it comes up 6, it doesn't mean I've rigged it. If I buy a lottery ticket and win, it doesn't mean I've cheated. Some things are random.
and there are so many "coincidences", how's that?
What is a coincidence? Isn't it just something that appeals to the human brain's concept of "strange"? Let's take a random example. David Beckham was born on May 2nd. The Queen was born on February 6. Wow! There's a 1/133225 chance of that happening! But the thing is, something has to happen. And sometimes that thing is strange. When, for instance, was the last time that you were surprised that a really interesting and exciting coincidence didn't happen?
How did everything start?
This is a difficult question, but "God did it" doesn't solve anything. Where did God come from? Why did God make the universe as he did? How did God make the universe? How does God operate? How can you detect God? Simply invoking God doesn't solve any of the important questions.