Well, regarding christian holy scripture, it is my understanding that:
1. There were many different authors of thousands of jewish/christian writings, over many, many centuries, proposed as being inspired of god. Much room for error there.
2. Catholic prelates 300 years or more after the alleged time of christ selected a very small number (63?) of these writings to produce a canon - and by a simple majority vote (some books squeaked by by one vote.) Again, room for error.
3. None of the original writings were in English - and many have been translated from several languages several times before being translated into English. Again, room for error.
4. There are many versions (translations) of the holy canon produced, only one of which, at most, could be correct. Which one? - christians mightily disagree on this. More room for error.
5. There are over 10,000 sects of christianity, each of which professes to interpret holy scripture absolutely correctly. Which one - at most - of the 10,000 are not fooling themselves? LOTS of room for error.
6. In protestant thought, each person is his or her own priest and the H.R.C.C. is no authority at all (even though catholics prelates collected and voted - up or down - in determining what books the canon consist of). Thus, each christian may - or may not - be interpreting the canon correctly. There is much disagreement. Who - if any one - is right? All are equally sincere - but who is right? If any? SOMEBODY is in serious error - maybe Most?
There seems to be as much diversity of thought among christians as there are among any particular group of people on earth, now or in the past, religious or secular.
Atheists, however, agree EXACTLY on one point - they are convinced that monotheistic ontology is an apparent absurdity and is utterly lacking in plausibility - if proposed, that is, as historical and factual.
I suppose if atheists could offer any advice to christians it would be "Cut out all the internecine bickering and get it together - you're embarrassing yourselves."
