I think there are five:
Catholic
Orthodox
Protestant
Pentecostal
Anglican
i think there are no sects
Buddhism. There are many different sects.
There is many Sects in Islam, there is also diffrent types of Sunnis with different beliefs, sub sects within.
There are 6 primary branches with 23 different sects.
There are three sects of Judaism: Orthodox, Conservative and Reform.
There were many of sects surrounding the nonreligious
To differentiate the different sects.
There has virtually never been a time in Jewish history where there were no differing sects of Judaism. Sects come about as the result of different interpretations of the Torah and Talmud.
You can read about the different schools of Buddhism here: http://en.wikipedia.org/wiki/Schools_of_Buddhism
In Brahmins, there are many sub-sects. Few are listed below:Smarthas Babburkamme SmarthasBadaganadu SmarthasShivahalliIyengars Hebbar IyengarsKeelnaat IyengarsMandam IyengarsBread-IyengarsThengaleVadagaleMadhvasIyersSankethi
Many Buddhists don't consider Buddhism to be a religion, but a philosophy. There are many different sects within Buddhism, like Mahayana or Zen, which use different techniques to understand the true nature of reality, and interpret the teachings given by the Buddha somewhat differently. Most of those sects believe that the other sects are all valid interpretations of Dharma, though there are some who think theirs is the only way.
There are no formal sects in Confucianism.