The idea that the Bible is anachronistic because it mentions that Abraham had camels is an old one, at least 100 years. It has pretty much been debunked if you choose believe any of the many of pieces of evidence that have been uncovered that suggest that camels were known in those days.
Here is a useful link:
Yes, there were camels Think of it this way. Someone might in the future claim that domesticated horses were unknown in North America until the 18th century or so because all the bones found before that were of wild horses in the western plains.
