The messenger of Allah (saw) left us upon a clear path to be aware of the deviations that the shaytan has has created for us.
The Prophet Muhammad (saw) warned his followers: “I have left you upon clear proofs, its night is like its day, and no one deviates from it except one who is destroyed, and whoever lives (long) from amongst you will see great controversy. So stick to what you know from my Sunnah and the Sunnah of the rightly-guided Khaleefahs - cling to that with your molar teeth.” [Reported by Imaam Ahmed (4/126), Ibn Maajah (no.43), al-Haakim (1/96) and al-Baihaqee in al-Madkhal (51)]
The Prophet Muhammad (saw) warned us that we would become divided into many sects: “Indeed the people of the Book before you split into seventy-two sects. And this nation will split into seventy-three sects; seventy-two are in the Fire and one in Paradise”. And in another narration, “All are in the Fire except one.” It was asked: Who is that one? He replied, “That which I and my Companions are upon.” [Related by at-Tirmidhi (5/62) and al-Haakim (1/128)]
Ibn Mas’oud (ra) said: “Allaah’s Messenger drew a line for us and then said, “This is Allaah’s Path.” Then he drew lines to its right and its left, and said “These are different paths, upon each of them there is a Shaytaan (devil) calling to it”. Then he recited the verse “And Verily this is My Path, so follow it, and do not follow other paths for they will separate you away from His Path.” [Soorah al-An’aam, 6: 153]
Therefore we must stick to the Qur'aan and the Sunnah as was understood by the Sahaabah. The messenger of Allah (saw) also praised the first three generations of Muslims: "Verily the best among you (to follow) is my generation (the Companions [ra]), then those who follow them, and then those who follow them…" (Saheeh Muslim, Book: the Virtues of the Sahaabah, chapter 52 hadeeth #2535)
Here is what the Imams of the Salaf who followed the Sunnah as understood by the Sahaabah (ra) said regarding innovated creeds and the people of innovation...
Imaam ash-Shaafi'ie (d. 204H) (rh) said that: "A person meets Allaah with every sin except Shirk is better than meeting Him upon any one of the innovated beliefs." [Reported by al-Bayhaqee in al-I'tiqaad p.158]
In al-Kubraa (4/316) Ibn 'Umar (d. 84H) said: "Every innovation is misguidance, even if the people see it as something good." (Reported by Abu Shaamah no. 39)
Sufyaan ath-Thawree (d. 161H) said: "Innovation is more beloved to Iblees than sin, since a sin may be repented from but innovation is not repented from." (Reported by al-Laalikaa’ee no. 238)
Imaam ash-Shaafi'ie (d. 204H) said: "If a person meets Allaah with every sin except Shirk, it is better than meeting Him upon any one of the innovated beliefs." (Reported by al-Bayhaqee in al-I’tiqaad p.158)
Al-Layth bin Sa’d (d. 175H) said: "If I saw a person of desires (i.e. innovations) walking upon the water I would not accept from him." So Imaam as-Shaafi’ee then said: "He (al-Layth) has fallen short. If I saw him walking in the air I would not accept from him." (Reported by as-Suyooti in al-Amr bil ‘Ittibaa wan-Nahee anil Ibtidaa’)
Yunus bin Ubaid said to his son, "I forbid you from fornication (zinaa), stealing and drinking wine. However that you meet Allaah with any of these sins is better to me than that you meet him with the view of Amr bin Ubaid and the associates of Amr (i.e. the Mu’tazilah)." (Al-Ibaanah 2/466)
Sa’eed bin Jubair said, "That my son accompanies a sinful and cunning scoundrel who is a Sunni is more beloved to me than that he accompanies a humble and worshipful Innovator." (Al-Ibaanah no. 89)
Imaam Ahmad said, "The graves of Ahl us-Sunnah from those who committed the major sins are like gardens. And the graves of Ahl ul-Bid’ah from amongst their abstemious pious ones are hollow and empty. The sinners of Ahl us-Sunnah are the Awliyaa’ (Friends) of Allaah and the abstemious pious ones of Ahl ul-Bid’ah are the Enemies of Allaah." (Tabaqaat ul-Hanaabilah 1/184)
Imaam al-Barbahaaree (rh) said: "However, if you see a person whose manner and opinion is despicable, he is wicked, sinful and oppressive, yet he is a person of the Sunnah, accompany him and sit with him, since his sin will not harm you. If you see a man who strives hard and long in worship, is abstemious (abstains from worldly affairs), being continual in worship, except that he is a person of innovation, do not sit with him, do not listen to his words and do not walk along with him, since I do not feel safe that you will not eventually come to be pleased with his way and go to destruction along with him." [Sharh us-Sunnah no. 149]
A serious warning dear Muslims to have Ikhlaas and to stick to the Sunnah while fleeing from bid'ah and its people and their gatherings. It is still not too late for Ahl ul-Bid'ah to repent and give up hizbiyyah (biased partisanship) for innovated sects, their founders, and parties and come to the path of the messenger of Allah (saw) and his companions (ra), Ahl us-Sunnah wal-Jamaa'ah.