Two similarities--Both religions recognize many of the same prophets. Both were offshoots of the Hebrew religion.
Two differences--The Muslims use the Koran as their holy book. The Christians use The Bible as their holy book.
The Muslims believe that Mohammad is God's main human representative on earth. The Christians believe that Jesus is God's main human representative on earth.
Islam & Christianity are two important African religions. (:
I'd have to say Christianity for certain and with the rise of Islam, then Islam is number two.
They may have one or two very very minor similarities. Otherwise, they are completely different.
Islam and Christianity, or Islam and Judaism
Christianity and Islam
Christianity and Islam
Islam & Christianity.
Christianity and Islam.
Christianity and Islam
Christianity and Islam
Christianity and Islam
Judaism and Christianity.