That is exactly why doctors don't diagnose just using the DSM checklists. Obviously if they did, we'd all be mad as hatters. There are a whole load of other criteria which must be met, for example, the behaviours have to be detrimental to your life or to the lives of others around you. They also must be abnormal within your culture, which is why religious people aren't all immediately locked up and sedated.

I really wish I could remember/find the name of this other set of assessments that doctors make but alas I cannot. Also my knowledge is based on the UK system, where incidentally they use the ICD-10, which is like the european version of the DSM. Things may very well be different in the states or elsewhere.