Christianity was founded by the Apostles (disciples of Jesus Christ) soon after the death and resurrection of Jesus Christ in Palestine
Islam founded by Muhammad, 622 AD, Saudi Arabia
Christianity has 2.1 billion adherents
Islam has 1.57 billion adherents
The God of Christianity is One. His name is YHWH (YaHWeH). However, He is both unity and diversity--Father, Son (Jesus Christ) and Holy Spirit! There is no one like Him!
The God of Islam is One. His name is Allah, who has no equals
Christianity teaches that all have sinned and are thereby separated from God. Salvation is through faith in what God has done in Christ on the cross. Sacraments and good works should follow the new birth
Islam teaches that humans must submit (islam) to the will of God to gain Paradise after death.
Christians practice their faith by Prayer, Bible study, baptism, Eucharist (Communion), church on Sundays, numerous holidays.
Muslims practice their faith by Five Pillars: Faith, Prayer, Alms, Pilgrimage, Fasting. Mosque services on Fridays. Ablutions before prayer. No alcohol or pork. Holidays related to the pilgrimage and fast of Ramadan.
The scriptures of Christanity are the New Testament. They also believe the previous Scriptures i.e. Jewish Scriptures (Tanakh/Old Testament)
The scriptures of Islam are the Qur'an and subsidary writings called Hadith