Radioisotope decay rates are a constant, subject to environmental factors that affect absorption. Calibrating Carbon 14 data with tree ring surveys has provided excellent results, and archaeologists and other scientists rely on the info they get from carbon dating all the time.
Carbon 14 has only been disproved to those who already wanted it disproved.
This is no longer an argument, it is a shouting match, so I'm done. I mostly just wanted people to know that there are those of us who find value in intelligently discussing religion. Religion is an emotional subject, but it is a mistake confuse emotion with spirituality. If the emotion is coming from a confused person, it is confused emotion, and is easily manipulated for money by unscrupulous mega churchers, for example.
No, there has to be real, practical value in the ethical nature of any such discussions about what the great religious teachers taught. Jesus taught mercy and forgiveness, yet how much of that have we ever seen from the "Bible Belt"? Blind church ritual and loudly repeating "approved" magic spells do not create stable societies where people are allowed to grow and learn. They create a climate of fear where social security check grannies fork over their life savings to self-appointed theocrats who live high on the hog with their mansions, yachts, sportscars, booze, meth and prostitutes.
Investigating, thoroughly, the history of any religion or group of religions is essential. Don't trust what modern followers say, you have to go back to the source to find out what really happened, for yourself. It's worth it.
See:
http://en.wikipedia.org/wiki/Documentary_hypothesis