His first wife, Khadija bint Khuwaylid, seems to have been very influential in the formation of basic Islamic theology. Two of her cousins converted to Christianity. Other monotheistic religions that might have influenced her were Judaism, Zoroastrianism and Sabianism. Some people have also suggested Ebionitism, but there is no direct evidence that she ever met an Ebionite. Ideas that were commonly found in these monotheistic groups were:
- Belief in only one God.
- Belief that God sent prophets, including Noah, Abraham, Moses, David, Solomon, John the Baptist and Jesus.
- Belief in an afterlife of either Heaven or Hell. Zoroastrianism seems to have influenced Mohammed more than Christianity or Judaism here.
- Belief in a holy book.
- Ritual prayers and washings. The Sabian religion seems to have been the biggest influence on Islam here.
- Ritual fasts. Again, it was the Sabians who fasted for one month a year.
- Various moral basics, such as the condemning of murder (including the exposure of infants), adultery (including polygamy), theft, lies and idol-worship, in which monotheists were usually stricter than pagans.
This is not to say that Khadija "invented" Islam or "copied" it from the monotheistic groups. More likely, Mohammed himself accepted these ideas after he married Khadija, and they were already part of his thinking when he declared himself a Prophet.
Mohammed's second wife, Ayesha bint Abi Bakr, was also very influential in the formation of Islam. Her contribution was her phenomenal memory. She poured out long lists of facts about Mohammed's life and legal judgments. Without the 2210 hadiths are attributed to her, there would be far fewer written records about what Mohammed taught and did, and much of the structure of modern Islam would be missing.
Other wives made small contributions, but nothing on the scale we can attribute to Khadija or Ayesha.
- His fourth wife, Hafsa bint Omar, kept the original master-copy of the Qur'an. This would be important if modern Qur'ans were still based on this master - but they are not. The master was destroyed as soon as Hafsa died, and a variant reading became the standard Qur'an.
- The custom of purdah (keeping Muslim women veiled and at home) is sometimes attributed to Mohammed's seventh wife, Zaynab bint Jahsh, but this would probably have happened even if Mohammed had never married Zaynab as it can be traced to Omar's influence.
- It is probably directly because of Zaynab that Islam abolished adoption, but this is only a small point and not a basic aspect of Islam.
- Many sections of the Qur'an were revealed especially for one wife or another.
____________________________________________________________
Non of the wives of prophet Muhammad (peace be upon him) influenced the formation of Islam religion. Islam religion is founded by God and the prophet is assigned by God to convey God words revealed in Quran to people to guide them to the right path God. The wives of the prophet helped in conveying to people some of the prophet sayings and practices and were titled the mothers of the faithful. They were consulted on many women and marriage related issues. It is not true that Islam rules are influenced by Judaism or Christianity. The three religion were originated by one God; the Creator; and it is logic to have some similarities among the three religions for being rooted by same God. Refer to question below.