There's this little thing called radioactive decay that works pretty darn well, and it has nothing to do with circular logic.
The only argument that young earth creationists have against it is a miracle.
God changed all the rules of science lately in order to make the earth appear older than it is for grins.
Good luck with that argument.
God created -- therefore the rules of science belong to him. And have you ever though that maybe, just maybe, the methods of dating are wrong? You guys always go back to your dating methods invented by men and proclaimed true. Forgive me if I go back to God's Word and trust that as truth over what man has to say.