The theory of how it happened may not be random, but why it happened certainly is.
What do you mean, "why"? If you mean "why does natural selection exist", the answer is that it's a natural consequence of differential results due to variation. It's not as if some deity had to "install" a "law of selection" into the laws of the Universe. To the contrary, it would take a magic wand to *prevent* natural selection from inevitably arising when variability is present.
And besides, the theory that life somehow began from a primordial soup is most certainly random,
Wrong.
without purpose or explanation.
Wrong again.
"Wrong again."
Three wrongs don't make a right, but three lefts do.
Explain to me the exact moment when there was no life, and then suddenly there was life. How and why did this happen, and what evidence do you have for your assertion?