I would like to add that Sufism is nothing but a mixture of Islam, Christianity, Hinduism, Neoplatonism, Kalam and Phissophy. If you do a bit of research and compare various beliefs and practices of Sufism with the mentioned theological systems you will know the real face of sufism.
In Islam our beliefs and deeds are based on the concept of Tawheed and without Tawheed all deeds are in vein. In Sufism Tawheed is something which could be compromised either by beliefs or deeds (practice), by making a taaweel or by misinterpretation, intentionally or unintentionally.
The idea of Sufism flourished predominantly in the Indian subcontinent, parts of Turkey, Iraq, Iran and some parts of North Africa because the basic ideology was already present in these parts of the word. In Hinduism the idea of God incarnation (Hamawoost) was already there, so the Sufis had no hesitation to accept it and just named it Wahdatul Wajood which is a major shirk and disrespect to Allah S.W.T. Similarly Qawwalee, music and doing strange things was also adopted by Sufis from Hindu Bhajan, sufi dance and samaa was adopted from Hindu dance in front of an idol, exaggeration prophets and saints so that their respect and authority becomes equal to that of Allah S.W.T or even sometimes exceeds was adopted from Christianity, the idea of harsh practices to control Nafs for which there is no proof from Quran and Sunnah came from Christianity. The idea of living saints while they are dead in their graves and believing that they can interfere the system of the universe controlled by Allah S.W.T or believing that saints or dead people can help, or bless someone is from Hindu concept of sayeen baba, uncountable devi, devta kissing the thumbs or nails during taking the name of Prophet Muhammad S.A.W is exactly making cross while taking the name of Jesus A.S. This is a topic on which extensive research can be done.
