wa 'alaykum salaam wa rahmatullaah
As I've heard among other things, Bid'ah is worse than sins because a person who commits bid'ah thinks he is doing something right - so he does not make tawbah from it, whereas in the case of any Major sin a person knows that he must make Tawbah for it.
I'll quote some things below which should also bring some understanding inshaAllaah:
Sufyaan ath-Thowree (rahima-hullaah) mentions:
"Innovation is more beloved to Iblees than sin, since a sin may be repented from but innovation is not repented from".
al-Laalikaa'ee - Sharh Usool I'tiqaad Ahlis-Sunnah wal-Jamaa'ah (no. 238)
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From Islam-QA:
"
When a person innovates something and adds to the deen something that does not belong to it, he is implying a number of bad things, each worse than the last, for example: That the religion is lacking, that Allaah did not complete and perfect it, and that there is room for improvement.
This clearly contradicts the statement in the Qur'aan (interpretation of the meaning): "… This day, I have perfected your religion for you, completed My favour upon you, and have chosen for you Islam as your religion…" [al-Maa'idah 5:3]
That the religion remained imperfect from the time of the Prophet (peace and blessings of Allaah be upon him) until the time when this innovator came along and completed it with his own ideas.
That the Prophet (peace and blessings of Allaah be upon him) was "guilty" of either of two things: either he was ignorant of this "good innovation," or he knew about it but concealed it, thus letting his ummah down by not conveying it.
That the Prophet (peace and blessings of Allaah be upon him), his Companions and the righteous salaf (early generations) missed out on the reward of this "good innovation" - until this innovator came along and earned it for himself, despite the fact that he should say to himself, "If it was truly good, they would have been the first to do it."
Opening the door to bid'ah leads to changing the deen (religion) and opens the way for personal whims and opinions, because every innovator implies that what he is introducing is something good, so whose opinion are we supposed to follow, and which of them should we take as a leader?
Following bid'ah leads to the cancelling out of sunnah practices and the ways of the salaf. Real life bears witness that whenever a bid'ah is followed, a sunnah practice dies out; the reverse is also true.
We ask Allaah to save us from the misguidance of personal whims and from all trials whether they are open or secret. And Allaah knows best"
- Ameen! Source
here.
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Imaam Al-Awzaa'ee (rahimahullaah) said:
"When innovations emerge and the People of Knowledge do not show rejection against them, they become the sunnah [in the mind of the ignorant]."
[Tahdheeb Sharaf Ashaabul-Hadeeth of al-Khateeb al-Baghdaadee, p.46]
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Imaam Maalik (rahimahullaah) said:
"He who innovates an innovation in Islam regarding it as something good, has claimed that Muhammad (sallAllaahu 'alayhi wa sallam) has betrayed his trust to deliver the message as Allaah says (what means), 'This day I have perfected for you your religion.' And whatsoever was not part of the religion then, is not part of the religion today."
[al-I'tisaam]
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Shaikh Muhammad ibn Saalih al-'Uthaymeen (rahimahullaah) said:
"Therefore, the innovations, in reality are indirect criticisms of the Shari'ah; because they necessitate the implication that the Shari'ah is incomplete and that the innovation is a more perfect form of worship to seek nearness to Allaah as the innovator claims."
[Majmoo' Fataawa wa Rasaa'il - Volume Two, Number 345]
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'Abdullaah ibn 'Umar (radi Allaahu 'anhuma) said:
"Every innovation is misguidance, even if the people regard it as good."
(ad-Daarimee)
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Ibn 'Abbaas (radiallaahu anhuma) said:
"Indeed the most detestable of things to Allaah are the innovations."
(al-Bayhaqee in as-Sunan al-Kubraa (4/316)
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Hope that clarifies things a bit!
Edit: I didn't realize we were being tested?
wasalaamu 'alaykum