No, the reason religion is excluded is because delusions aren’t supposed to reflect cultural conditioning. Delusions are, by their very definition, an abnormal brain process. Cultural beliefs are not abnormal brain processes, no matter how irrational they are.
Please understand that this exception is accepted by the entire field of psychology. If you disagree with it, you have 200 years of psychological debate and study to contend with. Don’t pretend you’ve read enough to claim you have grounds to disagree with something the entire field of psychology considers a settled issue. No matter how much you wish religion is a mental illness, it’s not. Sadly, the irrationality of religion is fully explainable within the bounds of normal human psychology.
No, you’re wrong and I’m not going to debate this with you. Study some psychology before making false claims. Good-bye.