Adam And Eve Lived For 100s of years..of course they had many other Children!

Lost gospel books that have now been found in caves fill up these gaps in the regular Bible, as was explained on discovery channel, History Channel, and National geographic-

The Book Of Jubilees This obscure Hebrew text offers an answer to a
question that has vexed Christians for centuries — if Adam and Eve
only had sons, and if no other humans existed, who gave birth to
humanity? This text reveals that Adam and Eve had nine children and
that Cain’s younger sister Awan became his wife. The idea that humanity
was born of incest would have been radical — and heretical.

history channel website

The Moslem Quran always had a similar account of so many more children as would naturally be expected with people who lived so many 100s of years.

In Islam, the pinnacle of earthly bliss was reached when Adam and Eve witnessed the birth of their 1st children, a set of twins. Adam was a devoted father and Eve a contented mother. The twins were Cain (Qabil) and his sister. Later Eve gave birth to a second set of twins, Abel (Habil) and his sister. The family enjoyed the bounties and fruits of the earth provided by their Lord. The children grew up to be strong and healthy young adults. Cain tilled the land while Abel raised cattle.