Says who? That is known as an argument from ignorance. Just because you are incapable of grasping how something might have occurred does not make it magic.
Just because someone floats does not mean they are a witch.
"Strange that you would call me credulous since you are the one arguing for the existence of something that is "outside the natural world" and hence incapable of producing evidence."
Not incapable at all. The existence of the universe and life itself cannot be attributed to natural laws and are evidence for a supernatural God.
The credulity comes from believing that such things 'just happened'.