England apex
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Muslims never conquered any religion. It was the teachings of Islam religion just to free the will of people to be able to practice the religion they are convinced with. It is a basic principle in Quran that no compulsion in religion.
Quran says (meaning English translation):
"There shall be no compulsion in [acceptance of] the religion. The right course has become clear from the wrong. So whoever disbelieves in Taghut and believes in Allah (God and same God in Christianity and Judaism) has grasped the most trustworthy handhold with no break in it. And Allah is Hearing and Knowing." (2:256)
The question as posed is nonsensical, Islam is a religion, which means that it is an ideology, customs, traditions, etc. but not something physical. As a result, it cannot conquer anything. Muslims have conquered territories that were previously majority-Zoroastrian, majority-Christian, majority-Hindu, majority-Buddhist majority-Sikh, majority-Animist, and majority-Polytheist. They also conquered regions with large numbers of Jews (but there was no place that Muslims conquered that was already majority-Jewish because there were no such places prior to Ottoman Thessaloniki). All of those religions that existed in territories that Muslims have conquered still remain to this day. Admittedly, Zoroastrians are not doing terribly well today, but that is more an issue with the Safavid Empire in the 1500s-1700s.
Northern Europe.
Fighting between Gupta nobles allowed Muslim forces to successfully conquer parts of India.
The Muslims did not successfully conquer a wide variety of regions. They never conquered (or attempted to conquer) any place in the New World or Australia. They did not penetrate Central or Southern Africa, save perhaps for the coasts. They were prevented from gaining France (Gaul), England (Britannia), or Germany (Germania) along with much of Northern Europe because of the Battle of Tours and the Byzantine Empire.
The Muslims did not successfully conquer a wide variety of regions. They never conquered (or attempted to conquer) any place in the New World or Australia. They did not penetrate Central or Southern Africa, save perhaps for the coasts. They were prevented from gaining France (Gaul), England (Britannia), or Germany (Germania) along with much of Northern Europe because of the Battle of Tours and the Byzantine Empire.
The Muslims conquered the Iberian Penninsula
Fighting between Gupta nobles allowed Muslim forces to successfully conquer parts of India.
Northern Europe.
He didn't conquer a religion, he conquered nations.
Muslims successfully conquered all of the Middle East and North Africa. They also controlled large swathes of Southeastern Europe, the Iberian Peninsula, Central Asia, and the Indian Subcontinent. Islam spread to other regions (like Sub-Saharan Africa and Indonesia) through primarily peaceful methods.
Islam is the religion worshiped by Muslims
Muslims are practitioners of the religion called "Islam".
Muslims are followers of Islam religion. Refer to question below.