I am Christian. I do not for one second believe that all God’s children were descendants of the Adam and Eve. Most especially since there are two different days of creation written of and about. Genesis 1:26 on the six day uses the plural of they and them. And at the end of chapter 1 God said his creation was good.
In Genesis 2:5 God said there was no man to till the ground, hence He made the farmer. At least a couple of thousand years later (Peter says a day with the LORD is as a thousand years and a thousand years is as a day) we are given the formation of the Adam... we are not told how long after the Adam was formed God put him to sleep and removed a ‘curve’ and made woman.
Most Christians cannot tell the difference in the two different days of creation of flesh bodies for the souls/spirit to travel this flesh journey.
Interesting to consider the ‘state’ the Adam was initially formed.
Evolution is a hoax, specifically because of the reason given for this flesh age. Christ said to ‘see’ the kingdom of God humans needed to be born of woman... Now that would exclude those first fully formed adults. Adam was not alive - living until the breath of life which means soul was breathed into his nostrils.
Christians like Paul the Apostle, for instance.
If Adam was not the first man, Christian theology makes no sense. If he was an allegory, you're worshipping a Creator who is descended from a fictional character.