Question: Who did the person considered the founder of three major monotheistic religions marry after the death of Sarah?

Knowledge 1: Abrahamic religions
The Abrahamic religions, also referred to collectively as Abrahamism, are a group of Semitic - originated religious communities of faith that claim descent from the practices of the ancient Israelites and the worship of the God of Abraham. The term derives from a figure from the Bible known as Abraham. Abrahamic religion was able to spread globally through Christianity being adopted by the Roman Empire in the 4th century and the Islamic Empire from the 7th century onward. As a consequence, today the Abrahamic religions are one of the major divisions in comparative religion (along with Indian, Iranian, and East Asian religions). Judaism, Christianity, and Islam are the largest Abrahamic religions in terms of numbers of adherents. [SEP] Knowledge 2: Keturah
Keturah (Hebrew: קְטוּרָה ‎, Modern Ktura, Tiberian Qəṭûrā; possibly meaning ``incense '') was a concubine and wife of the Biblical patriarch Abraham. According to the Book of Genesis, Abraham married Keturah after the death of his first wife, Sarah. Abraham and Keturah had six sons.
Knowledge 1: Abrahamic religions
The Abrahamic religions, also referred to collectively as Abrahamism, are a group of Semitic - originated religious communities of faith that claim descent from the practices of the ancient Israelites and the worship of the God of Abraham. The term derives from a figure from the Bible known as Abraham. Abrahamic religion was able to spread globally through Christianity being adopted by the Roman Empire in the 4th century and the Islamic Empire from the 7th century onward. As a consequence, today the Abrahamic religions are one of the major divisions in comparative religion (along with Indian, Iranian, and East Asian religions). Judaism, Christianity, and Islam are the largest Abrahamic religions in terms of numbers of adherents. [SEP] Knowledge 2: Christian
A Christian ( pronunciation (help·info)) is a person who adheres to Christianity, an Abrahamic, monotheistic religion based on the life and teachings of Jesus Christ. "Christian" derives from the Koine Greek word Christós (Χριστός), a translation of the Biblical Hebrew term mashiach.
Knowledge 1: Abrahamic religions
The Abrahamic religions, also referred to collectively as Abrahamism, are a group of Semitic - originated religious communities of faith that claim descent from the practices of the ancient Israelites and the worship of the God of Abraham. The term derives from a figure from the Bible known as Abraham. Abrahamic religion was able to spread globally through Christianity being adopted by the Roman Empire in the 4th century and the Islamic Empire from the 7th century onward. As a consequence, today the Abrahamic religions are one of the major divisions in comparative religion (along with Indian, Iranian, and East Asian religions). Judaism, Christianity, and Islam are the largest Abrahamic religions in terms of numbers of adherents. [SEP] Knowledge 2: Inside (2007 film)
A baby in utero is seen, with the mother's voice heard soothing it. The baby recoils as if struck. Expectant mother Sarah has been in a car accident, and her husband has been killed. Months later on Christmas Eve, Sarah is making final preparations for her delivery the following day. Still reeling from her husband's death, Sarah is now moody and depressed.

Answer: Keturah