I did not wish to offend you by implying you were lying, so I tried to be as careful as I could in my wording.
I will write this, there is nothing you have written that indicates in anyway you ever were properly instructed in the Catholic faith. Again the conclusion is either you were never a Catholic, or the instruction you received was so poor it made a mockery of the very term “catechism.” I suppose it is possible that you had zero instruction.
Now if I state plainly I suspect it is the first, the implication you are lying is out in the open for all to see. Even when evidence points to that being a valid conclusion I hate to leave it as the only one. After all there are other possibilities. Therefore; I add two other possible reasons for the jaw dropping ignorance you show about Catholic teaching to reflect a more benign cause.
What ever the cause of your ignorance the fact remains. Catholicism does not teach that Truth is found in man. That you have stated it does show a serious want of grasping the subject.