Dangers of Bid'ah
There is immense danger in observing acts of Bid'ah; the enemies of Islam would attack Islam and Muslims through it. So every Muslim should be cautious so that he would not be used as a tool to harm the Deen or Muslims in any manner. Furthermore, a Muslim should not cover up or hide a man of Bid'ah.
The enemies of Islam have been able to divide the Muslims with these devious acts of Bid'ah. Whenever an act of Bid'ah becomes widespread, an act of Sunnah would be abandoned by people…eventually the observance of Bid'ah practices would lead to one's abandonment of the Deen of Allah! The Prophet said:
'My Ummah will be divided into seventy three sects, the sect with the most adherents would be a sect whose people give precedence to their intellects and draw analogies to claim the lawful unlawful and the unlawful lawful.' (Haakim #8325)
In order for a person to safeguard himself he should refrain from doing whatever belies the Book of Allah and the Sunnah of His Messenger.
The Prophet said: 'To forge a lie against me is not like forging a lie against anyone else; whoever forges a lie against me, let him assure his seat in Hell.' (Muslim # 4)
Whoever wants to be successful, and hopes for the reward of Allah, he should follow the example of the Prophet. Allah, the Exalted, says: (Say, if you love Allah, then follow me and Allah will love you and forgive you your sins, and indeed Allah is all forgiving and merciful.) (3:31)
A person should not emulate or follow any other individual for they are not infallible; they make mistakes, and have worldly desires and may follow their whims.
Warning and Admonition
Abdullah ibn ad-Dailami said: 'It has reached me that the Deen would fragment and become lost by abandoning the Sunnah. People would abandon Sunnah practice after Sunnah practice, just as a rope would become weaker and weaker.' (Ad-Darimi #98)
Read More +Is the Deen of Islam Complete?
It is known by necessity that the Deen of Islam is complete, as Allah, the Exalted, says: (This day, I have perfected your Deen for you, completed My Favor upon you, and have chosen for you Islam as your Deen.) (4:3)
Read More +The ruling of adding something to the Deen which is not legalized by Allah or the Prophet
Allah, the Exalted, says: (Yes, but whoever submits himself to Allah and he is a Muhsin (good-doer) then his reward is with his Rubb (Allah) on such shall be no fear, nor shall they grieve.) (2:112)