I think you will need to give more detailed examples of this alleged link you postulate between religions and acts or comments that have been defined as racist, Barq.
Medieval, yes. Patriarchal and patronising, yes. Tribal, yes. Homophobic, yes. Anti - scientific, yes. I can think of examples of all of those attitudes in various doctrinal statements from the mouthpieces of several of the organised religions over the years, but I cannot bring specifically racist commentary to mind.
I cant remember anyone here, or anyone in general life, for that matter, labelling Christianity as racist, so, based purely on my own experiences, I would disagree with your initial point.It might be the case that some people are using the term racism as a lazy shorthand, when what they really mean is culturalist possibly?