Do most Christians believe in young earth creationism?

Of the Christians I know in real life, such as my Catholic mom, none of them believe the earth is only 6000 years old. But this view seems to be pretty common among Christians online (at least of the ones I’ve encountered on other sites, for example). Is young earth creationism a mainstream Christian belief? Can someone be a Christian without taking every part of the Adam and Eve story literally and believing the earth was created in 5554 BC?

Please no mockery or snark. Interested in genuine answers.