When the Son of God took on flesh, was born of the Virgin Mary, was incarnate by the Holy Spirit, within about 40 hours (probably much less) his intestinal tract was colonised by hundreds of species of bacteria, fungi, and protozoa.
When he came to John the Baptiser at the Jordan River, his mature human body consisted of roughly 10 trillion human cells and 10 times more bacterial cells. As far as we know, many of these bacteria do nothing other than live peaceful and quiet lives on our various internal and external surfaces. But some do more: certain species of our internal flora break down carbohydrates which are otherwise indigestible; others produce valuable vitamins; they train our immune system, and prevent the growth of more harmful species of bacteria.
When the Son of Man came as the One True Humanity to be what no human could be, and, when through his physical death he made reconciliation between God and his world, it is not to much to say that he was assisted on his way by trillions of micro-organisms.
It’s a weird thought, isn’t it? Sorry if it sounds flippant.
What is the point of the world? Why did God create it in all the vast complexity and diversity of it’s forms? I’m not trying to make a flippant point. The one who offered up his human body as a sacrifice is also the one who made all things and for whom all things exist. Including bacteria. He called them into being and maintains them there by his word.