What evidence do Christian have forthe Earth only being 6000 years old?

evidences - the gravitational half-life of the earth as of 1900 years cannot go back doubling to allow for life to live on the earth. The sun has been proven to have been shrinking. Population totals prove it is not beyond 10,000 even with a worldwide flood, sicknesses, pandemics and such. Dust on earth's moon. These are just a few, there is a lot more if you would care to truly look them up.

There is no such evidence, and only a handful of extremist fundamentalist Protestants - about 5% of Christians - make such claims.

A made up fantasy they think is real.

The evidence for that is Exodus 20:11. Otherwise there is no evidence of such. Heb. 11:1., Rom. 10:17.

They consider:

- Eve and Adam were the first humans ever (not the founders of the earliest Israelite settlement)- Earth, Eve, and Adam were created the same week- Then they add the ages of all Jesus' ancestors from Adam when they fathered according to the Bible account, especially Jesus' genealogy.

- they found 4000 years give or take a few centuries.

- plus 2000 years since Jesus = 6000.

If you withdraw the unlikely ages of some prophets at 600 or 900 years old,  the biblical genealogy is consistent with a +/- 3000 years history of Israel. 

By the way, the earliest mention of Israelite settlement in Canaan is from Egypt in 1209 BC. and neighboring nations mention a little kingdom named "the House of David" around 850 BC.

True Christian know that mankind is 6,000 years old.

But the earth can be millions of years old.

Fact is: The end product of radioactive decay in rocks in the earth testify that some rock formations have been undisturbed  for billions of years.

None. 

And no Christians, your copy of a collection of fairy tales written by sheep herders in the desert thousands of years ago does not count as proof.

You mean, like REAL evidence? Evidence that can be found outside of the Bible, and agrees with the Bible?

None.

Update:  LOL at FB. Please explain how the shroud of Turin validates a 6,000 yo Earth.

It would be highly inaccurate to impy that all Christians believe the "young Earth" concept. The vast majority do not.

-Debating creationists on the topic of evolution is rather like trying to play chess with a pigeon — it knocks the pieces over, craps on the board, and flies back to its flock to claim victory.-Scott D. Weitzenhoffer

None whatsoever.

“Rational arguments don’t usually work on religious people. Otherwise there would be no religious people.” - Gregory House, M.D. Season 4 Episode 2 The Right Stuff.