The words "such a complex organism" should give you a big hint at the angle the OP is taking.
Now this is a perfectly valid standpoint for the layperson, who hasn't read much, hasn't watched Attenborough-type nature documentaries but has, at least, taken in the world around them with the senses they possess. It's complicated, how can it have possibly got like that, starting from inanimate chemical compounds.
As I pointed out, it takes several years of studying the relevant school subjects and a degree in molecular biology/biochemistry to get the full picture. It's simply beyond the scope of a Q&A website.
As a stop-gap you could read up various buzzwords on Wikipedia and by digging down into the bibliography, you can do-it-yourself, acquainting yourself with some areas of knowledge which interest you, in your own time but a properly structured university course is the only way to go if you want to pass on your findings without actively misleading those who know less than you do.
Then again, if you are not aiming to be employed in scientific research, you can save yourself a great deal of intellectual effort by not even trying to learn the science: attribute what you see to God and get on with your life. Just stop pestering scientists about the "truth" of the matter. You waste their time as well as your own. Neither side will ever change their mind and why should they?