Fitne-e-Qadianiat, Fitna-e-Yusuf Kazab and other all fitnas occurred due to blindly following of Peer, Faqeers and Walis; and not following directly Quraan and Authentic Hadeeths. If you follow Quraan and Authentic Hadeeth then you will never have non-Islam believes such as grave worshiping, believing that the Peer has knowledge of unseen and knowledge of future, believe that the dead Peer in the grave is capable of blessing you with a child, believing that your Peer is in direct contact with Prophet Muhammad (pbuh) through dreams or by other means, believing that Sidja-e-Tazimi is not SHIRK to your Peer or to the grave, believe that your dead or alive Peer can do Karamats (miracles).
If you are strictly following the teaching of Quraan and Autentic Hadeeth and are not blindly following any Peer then even you deviate from your path and somebody points it out to you you can quickly consult the Quraan and hadeeth and will be able to quickly correct yourself, which is not possible if you are blindly following a Peer.
Prophet Muhammad ( pbuh) stressed the importance of following the Quran and Sunnah and the danger of introducing any innovations into Islam. It is known that the Prophet said: “Whoever does a deed which is not in accordance to my commands (i.e. the Islamic Law), it shall be rejected.” (Saheeh Muslim)
Ibn Mas’ood (a companion of the prophet), may Allah be pleased with him, said: “The Messenger of God, may the blessing and mercy of God be upon him, made a straight line on the ground with his hand, then he said, “This is the straight path of God.” Then he made a (short) line on each side of the straight line; then he said, ‘These (short) lines, each one has a devil inviting people to it.” Then he recited the verse (of the Quran): “And this is My path straight. So follow it, and do not follow (other) ways, lest they lead you away from My path.” (Quran 6:153)
Saheeh: Reported by Ahmad and an-Nasaae’e.
Start blindly follow you Peer, Faqeer and walis and you will end up into Qadianism, Sufism, Qadrism, Naqshbandism, Chushtism....