DD: Why do you need tools [to detect that which can kill you]?
Because our senses are too limited for science. There are animals that see and hear things that exist beyond our direct experience. There are other tangible artifacts that require more delicate tools.
It is the job of science to explain what is measurable. Human sensory apparatus is not sufficient for that job.
Indeed, without external mechanisms of some kind, it is very difficult to determine the rate of time passing, and our defintions of segments of time are for the most part arbitrary. Time is not a monolithic, constant, perfectly forming dimension - it is malleable, changing relatively through the simple difference of rate of motion.
What came before time? There may have been no time at all. None of us were there. We often lack the imagination of an Einstein to form a theory of what that might have been like, it is so far out of our experience.
My point is that simply because we are not familier with an artifact coming into existence without a designer does not mean a designer must have existed for life. There is no evidence that life was designed, and there is evidence that life forms have evolved.
We are not generally familiar with time flowing in different ways, but that does not mean that it always flowed at a predictable rate - indeed, the evidence is that time is a relative "dimension".
From what I have seen, the human psyche becomes very uncomfortable when presented with a paradigm outside of its common experiential context, and therefore insists that things must be the way that reduces anxiety. "There must have been a Creator." "Time must have always flowed."
It's as if very few people can be satisfied with, "I don't know."