It depends on several factors.
First, according to Islamic theology, Islam has existed since the Creation of the Universe, so under that definition, Islam is necessarily older since Catholicism was developed within the world.
However, if we proceed from a historical basis there is a serious debate on which is older for the following reason: the Unified Church was founded in the First Century C.E., nearly 500 years before Islam was founded. The Unified Church was an umbrella group the would eventually schism in 451, dropping the Monophysites and Miaphysites (such as the Copts, Armenians, and Ethiopians, etc.), and again in 1054, when the Unified Church had the Great Schism which led to independent Catholicism and Orthodoxy. Therefore, Catholicism as a distinctly named church is younger than Islam by around 400 years, but Catholicism traces its origins to the Unified Church which is older than Islam by around 500 years.
Christianity, not Islam, is the second oldest religion. They were both preceded by the Hebrew monotheistic religion, and by the non-monotheistic Zoroastrian religion and many other different beliefs involving worship of idols and natural phenomena.
Christianity and Islam.
3 islam christianity and judaism
Islam, Christianity and Baha'i.
Islam surely has many more followers than Christianity !
Adherents woldwide of these religions approximately are; Islam ; 1.3 billion (Sunni: 940 million) Christianity ; 2 billion Judaism ; 14 million Islam is the religion which has spread out the most over the years.
Islam, Judaism and christianity
Islam is one of the three Abrahamic faiths and can easily be compared to them
Many of them embraced Islam and became very good Muslims.
Mostly Islam. There is a Christian minority - many of them refugees from Iraq.
The 5 major religions from oldest to youngest are: Hinduism, Judaism, Buddhism, Christianity, & Islam.
No, Christianity may have marginal more followers (if valid) but not twice as Islam followers per Quran revelation to prophet Muhammad (PBUH).