http://wiki.answers.com/Q/When_was_Islam_founded
“Islam religion per God revelation of Quran to prophet Muhammad was founded by the start of Quran revelation by God to prophet Muhammad through the Angel Gabriel (Jibril) in Mecca (currently in the Kingdom of Saudi Arabia) in year 610 AD.”
You are missing my point.Christianity, Jewish and Islamic religions all consider Abraham in the ancestery of their respective beliefs.The split between jews and the philistenes was before the common era.Thats when Christianity took off.