1. The Quran indicates that Y’aqub (peace be upon him) gave final
instructions to his sons before he died. “… he said unto his sons, ‘What
will you worship after me?’ They said, ‘We shall worship your Ilah (God —
Allah) the Ilah (God) of your fathers, Ibrahim, Isma‘il, Ishaq, One Ilah
(God), and to Him we submit (in Islam).’” [2:133 – interpretation of the
2. The scripture of Ibrahim (peace be upon him) is mentioned in Surat al-A’ala 87:19 (interpretation of the meaning): “The Scriptures of Ibrahim and Musa”; and in Surat al-Najm 53:36-37 (interpretation of the meaning): “Or is he not informed with what is in the Pages (Scripture) of Musa (Mose), and of Ibrahim who fulfilled (or conveyed) all that (Allah ordered him to do or convey).”
3. The country with the largest Muslim population in Africa is Nigeria, and in Asia, Indonesia. The Indonesians became Muslim through contact with Muslim traders from Hadramawt as is well known. Perhaps this is what the questioner wanted to know, even though the question is not quite clear.