In a general sense they may agree, but when "billions of years" are involved it's kind of hard to be precise, don't you think? Go ahead and posit your own belief in the age of the earth. We'll see if every scientist lurker who cares to add to the discussion agrees with your belief. Out of bias for your faith they might agree, but they certainly have no more entitlement to credibility than the next guy who adds or subtracts a billion years from your notion.
It's not just what I think. It's a fact. Agreement about the age of the earth in scientific circles is far from being established, and it should be that way, because science hasn't even figured out what time itself is.
Not really. All sorts of lines of research have zeroed in on pretty much the same age for the Earth: 4.5 billion years. You'd be surprised if you actually did any reading on the subject instead of pontificating from a position of ignorance.
Citations, please. Otherwise, you're just talking out your tail end.
http://www.talkorigins.org/faqs/faq-age-of-earth.html
http://www-astronomy.mps.ohio-state.edu/~pogge/Ast161/Unit5/deeptime.html
http://www2.nature.nps.gov/geology/usgsnps/gtime/ageofearth.pdf
http://en.wikipedia.org/wiki/Age_of_the_Earth
http://gpc.edu/~pgore/geology/geo102/age.htm
http://pubs.usgs.gov/gip/geotime/age.html