The problem I have with the big bang theory is where did all the stuff come from to make the big bang....and why would this magically appearing stuff from whence came the universe... just decide to blow up? So Strings or no strings...where did it all come from? Blow up a speck of nothing and you get a universe complete with sentient life forms? Now, tell me the big bang doesn't take a heck of a lot of faith to believe in?!
I can only surmise that we don't exist. Which may be closer to the truth than we know. Or not.
I've got a "string" theory. The physical universe does NOT exist. We are mental energy, we have volunteered to be placed into a game and the only way to exit that game is to die, then you go back to being um, or not being what we think of as being. But once out of the game our memories will return. Which leaves us with the big questions as to origin...or maybe we know the answers as soon as we exit the game.
The only thing I know for sure is that none of us know for sure.