The mitochondrial Eve and Y-chromosomal Adam weren't the first people nor did they know each other or have children. Even if they were, how would the human race survive this long since inbreeding would be necessary for them to populate the Earth? And how would you explain neanderthal fossils since Adam and Eve were supposedly the first beings on Earth? I'll admit I am not well-read into genetics and whatnot but I don't need to be to decide what I believe is probable and not
- How do you know Adam and Eve were not together? Better yet, how did your sources affirm that?
- Based on genetic science, there is a phenomenon called "Founder Effect". A single pair can have 75% or more of the variation of the entire population they will produce as their progeny. For this reason, Adam and Eve were unlike us with genes that are harmful when it comes inbreeding. Perfect design from a perfect designer.
- In Islam, Adam and Eve were not the first intelligent beings on earth. Quran uses the word "Successor" to describe humans which indicates that people/humans replaced an existing beings on earth. Some of these replaced creatures were mentioned. Intelligent beings far superior in terms of strength than humans. It is in the Quran.
- We all need to decide our beliefs based on reasonable and rational thought using available evidence. This evidence can be the Quran which makes claims a mere human can not claim, or in Nature/Science which can teach us the hidden hands behind their intricate design.
As long as you are a curious human-being, it would be hard to avoid asking yourself basic existential questions.