I didn't read every page of the thread but read enough to get the gist of how the discussion is going.
A good definition of 'discrimination' comes from the Business Dictionary:
1.Bias or prejudice resulting in denial of opportunity, or unfair treatment regarding selection, promotion, or transfer. Discrimination is practiced commonly on the grounds of age, disability, ethnicity, origin, political belief, race, religion, sex, etc. factors which are irrelevant to a person's competence or suitability.
2.Unequal treatment provided to one or more parties on the basis of a mutual accord or some other logical or illogical reason.
3.Differences in two rates not explainable or justifiable by economic considerations such as costs.
Read more: What is discrimination? definition and meaning
And most comprehensive definitions add:
4. Choice between good and evil, right and wrong, negative and positive, or choices made via preference as to what is appropriate, proper, aesthetically pleasing, etc.
And I think is in Number 1 or Number 4 that most discrimination against Christians occurs. Christians are much maligned on message boards and characterized as stupid or fanatics or delusional etc. etc. etc. but that is just insulting and not discriminatory to the extent that Christians are denied anything other than respect for their views.
Christian candidates for office can definitely be discriminated against as a Mike Huckabee or a Ben Carson will be deemed unsuitable for high office because of their Christian views and studies or research done by some organizations will be dismissed as prejudiced or irrelevant because the organizations are founded on Christian values.