In Doctor Who, there's no concept of multiple timelines. I remember The Doctor seeing himself after travelling back in time (viz. when Rose saved her father and in the recent episode Before The Flood). So, all events in Doctor Who happen in the same timeline.
Now, the Bootstrap Paradox. When there are concept of multiple timelines, it's not really a big problem. But, The Doctor was seen talking about the Bootstrap Paradox. Hell yeah, he even told us to Google it without giving the solution. In his own words:
So there's this man. He has a time machine. Up and down history he goes, zip zip zip zip zip, getting into scrapes.
Another thing he has is a passion for the works of Ludwig van Beethoven.
And one day he thinks, what's the point of having a time machine if you don't get to meet your heroes? So off he goes to eighteenth century Germany. But he can't find Beethoven anywhere. No one's heard of him, not even his family have any idea who the time traveller is talking about.
Beethoven literally doesn't exist. This didn't happen, by the way. I've met Beethoven. Nice chap. Very intense. Loved an arm-wrestle. No, this is called the Bootstrap Paradox. Google it. The time traveller panics.
He can't bear the thought of a world without the music of Beethoven. Luckily he'd brought all of his Beethoven sheet music for Ludwig to sign. So he copies out all the concertos, and the symphonies and he gets them published. He becomes Beethoven. And history continues with barely a feather ruffled. But my question is this. Who put those notes and phrases together? Who really composed Beethoven's Fifth?
So, my question is: Who really composed Beethoven's Fifth? The time traveller copied it and Beethoven copied it too. With the concept of multiple timelines, it's not really a big deal. In the original timeline, Beethoven composed it and when the time traveller travelled back in time, it created a new timeline and in the new timeline, nobody composed it.
But, without the concept of timeline, who really composed the Beethoven's Fifth? If something artificial exists, there must be a creator.