Is there really such a thing as atheism?
Yes. Any thought, word or deed performed without consideration to deity is atheistic by nature. Brushing your teeth is a good example. Most people do not consider divine input when brushing their teeth, thus it is atheistic.
An atheist (especially when the label is self-applied) is someone who takes this approach to a majority of their life either actively or passively at their own discretion (this varies wildly from atheist to atheist). Many even go so far as to discuss it publicly on forums like this. One has only to read any thread on RF to receive objective empirical evidence of atheism.
Everyone has a religion of some sort.
Nonsense. The word means that which you have reverence for. It's a catch-all (however successful it is) designed to ignore the details of any particular religion. There are people who are strictly irreverant towards things held in reverence by others. They, at least, have no religion being that their philosophy is the antithesis of it.
Also, I find it generally rude to apply labels to people who patently reject them. If someone tells me they have no religion, I just take their word for it. What difference would it make anyway?
We all come up with some idea of how it all started
and how it will all end.
It all started when I was about 4 years old. There is no end in sight.
That would be my earliest memory. Everything before is hearsay. I believe it at my own discretion.
We all seek a purpose and meaning for our lives.
Except those that have found it. No, not me.
And at the beginning there was a Miracle. Either the miracle is God's
or we think the universe created itself out of nothing and for no reason
whatsoever.
I don't even have to pick! Boxes are only in your imagination. You can climb in them all day but it's hard to cram others into them.
The latter is the real miracle - a creation without space,
or time, or matter or energy, or physical laws or even mathematics,
bursting forth in the ultimate act of pointlessness.
Mathematics didn't exist unil well after humans. We made that stuff up. It works, but so does English and we made that up, too. Think about it...
Beside the point, naturally.
Everything that is part of the universe may very well have been here before it just may not have been combined the way it is now.
You really shouldn't let why cloud how, is my advice.