"Objectivity is completely excluded in human social interaction."

While we all have biases, these biases do not completely exclude objectivity. Objectivity should not be considered only an absolute, but is a range. We are all more or less objective regarding the variety of things there are, depending on our beliefs.

Some of us strive to be utterly objective, and some of us strive to be utterly faithful to a given dogma. I strive to eschew the latter because I believe we are incapable of ascertaining understanding of the reality we are part of due to our limitations. I may be accused of taking objectivity as dogma I am faithful to, just as I note that Atheism is as insuperable and dogmatic is every other religion. Every argument that faith in God is insuperable factually also can be turned around and apply to belief there is no God.

You are right there are weaknesses in my rationality.