Humans are just too complex?

So from what I've gathered, most arguments for God comes down to humans are just too complex to be created by chance. everything in a human being is perfectly made for its purpose. (that's not exactly true considering the wisdom teeth and other stuff) the statistical data says that for a cell to be made by chance is like having a tornado blow through a junk yard and making an airplane. (I can't really comment since i'm not sure how this percentage is calculated. did they take into account RNA world or non biological catalysts and stuff?) but my question is if humans are way too complicated to be made by random then how come God is not way too complicated to be made by random? if God is not made by random then what made him? I often hear he's just there, eternal, but then that doesn't really say anything,.. Why can't i say cells or some type of life are just there, eternal?