Where did it all begin?

I confess that I have asked myself that a few times, many times. I've contemplated it. My understanding of eternity is relatively limited, for obvious reasons, being a mortal creature and all, it kind of puts a damper on the level of understanding I can achieve and how quickly and what not.
In any case, when I do think of the nature of God and where "it all began," I simply end up being perplexed.
I don't intend for this to be a long post, but I hope to write what I can and re-examine it at a later date.
I was on an anti-Mormon website, as much as that bothers a few of my LDS friends, and found one of the posts on their forum interesting. They were discussing what their "#1 fact that proves Mormonism is false," was for each of them. One member posted this:
"Time had a beginning. It's illogical (mathematically impossible) to intelligently believe that time extends infinitely into the past. So who was the first god, or what was the first "god"?"
I find this interesting.
Not too long ago I caught the end of a documentary on the "Sasquatch." A man said something
that really hit me. Basically, if mankind thinks we've discovered all there is to discover, if we can't even conceive of there being some kind of creature like the Sasquatch, our heads have grown large indeed.
I had a discussion with a friend while we were waiting to go to

our respective classes. The Titanic came up, and subsequently, he told me he had heard something about how some scientists would give their right arm to be able to spend an hour on the bottom of

the ocean floor. I don't doubt that there are people who have said this. There are creatures down there that we can't even dream of; creatures of magnificent size, of unbelievable ferocity, creatures which could easily become the subjects of our nightmares.

Why do we then believe like we've figured everything out? How can we pretend that there are things out there which we cannot control, things that we cannot put into a laboratory and poke and prod? There are creatures, concepts and truths in this world which will not fit neatly into our mathematical formulas, and I wouldn't hesitate to say that there are many, many things which we will never know about while we're here.