Who were the founders of Judaism and Islam?

Answer 1

Judaism: Abraham. See also the attached Related Link.

Answer 2

• The founder of both God religions; Judaism and Islam; is Allah (or God in English and same God worshiped in Islam, Christianity, and Judaism).
• God assigned Moses (and his brother) to convey to his people the God message to worship God as the one and only one God with no partner and no associate.
• God assigned Muhammad to convey to his people the God message to worship God as the one and only one God with no partner and no associate.
• In reality, Islam (as submission to God as the one and only one God with no partner, no father, no son, no companion, no associate, and no equivalence) is the God religion since universe creation. However, Islam per Torah revelation to Moses is called Judaism, Islam per Bible revelation to Jesus is called Christianity, and Islam per Qur'an revelation to Muhammad is called the same name Islam as it is the last God religion, Qur'an is the last God holy book, and Muhammad is the last God prophet.
• All God prophets since Adam, through Noah, ..., Abraham, Ismael, Isaac, Jacob, Joseph, Moses, David, Solomon, ..., Jesus, and Muhammad (peace be upon them all) called their people to Islam as submission to God; the one and only one God and the sole Creator.