Assuming that abiogenesis and creation are the only two possibilities, what probability do you assign to each of them? Sitting on the fence and saying "I don't know" is not an acceptable answer.
What's wrong with being honest?
I have said ad nauseam to the point of throwing up that I don't know how life started.
Do you want me to drag something from thin air and make up a story. Allocating probabilities to your two options - if there are indeed just two options - implies that I have knowledge that I don't possess.
Are you prepared to front up and disclose your answer to your question: "Assuming that abiogenesis and creation are the only two possibilities, what probability do you assign to each of them?"
And of course your answer would only have meaning if you disclose details of your probability calculations.
Over to you to prove that you are not a fence sitter.
