And who defines what is "valid"?
There is the problem. You admit that your own deductions are "valid" yet deny that to others.
Well, lets work on that problem as you see it. How about we take one subject we differ on and look at scripture to find justification or validation of one point or the other. You did see the end of that quote you posted from me that said from scripture right?
How about we take the assumption of Mary. How about you give me the valid deductive reasoning and scripture to back up that reasoning for the assumption of Mary.