The complexity of a human body is overwhelming. Sure!
But, this doesn't mean that there must a all-mighty being behind it to make it.
Endless time and endless space and material with properties that combines and divides under certain conditions, conditions that they mean for there 'neighbour'- material - and chance.
These are the ingredients the science needs to see correlations between planets and suns, chemical substances and bacterias, bacterias and mammal bodies.

Although these things are wonderful and fantastic, there is no need to imagine a maker.

Science and medicine have no advantage in imagining a maker, they have an advantage in supposing that this evolves from time, space, material and chance and that these conditions developed certain correlations that isolated further correlations and so on. That's where the insights came from that helped to develop all that help for ill people and so on.