The problem with using the genealogies to date the Earth is that in so doing, YECs are reading the genealogies as a 21st century human being would do, and there is no justification for doing this. Denis Lamoureux (whose term evolutionary creationist I have employed to describe my position) has begun a six part series on the meaning of Biblical genealogies. Part 1 is here.
Saturday, 8 February 2014
Denis Lamoureux - The Meaning of Biblical Genealogies (1)
Dating the Earth by summing the genealogies is considered by YECs to be a reliable guide to dating the Earth. They are of course wrong. Even before the advent of radiometric dating, 19th century geologists recognised that the Earth was much older than 6000 years. Radiometric dating merely confirmed the fact of an ancient Earth.