According to Shia Islam and when the 5 Imam, Imam Al Baqir (Alah Al salam) was asked if Adam was the first person earth? He answered "before our great father adam there were 1000 x 1000 Adam's" If we assume that our first modern father being the Prophet Adam created nearly 6,000 years BC as estimated by the Bible and many theologists, then as per the evolutionist time line who estimate the world to be nearly 5 billion years old, it would seem correct assuming each evolution of man lasting between 5000 to 6000 years multiply by 1000 x 1000 would give approx 5 to 6 billion years?