Islam: One God (Allah), Quran, Prophet Muhammad. Five Pillars: Faith, prayer, charity, fasting, pilgrimage.
Islam and Catholicism: separate religions. Islam: Muhammad, 7th century. Catholicism: Jesus, 1st century. No Catholic creation of Islam.
Ishmael was important in Islam's history, but Muhammad (PBUH), his descendant, founded Islam and received the Quran.