Shaikh Ibn 'Uthaimeen says:

" Innovation entails the adoption of dangerous ways":

1. It entails the refutation of Allaah's words; "this day I have perfected your religion
for you, completed My favour upon you and have chosen for you Islaam as your religion."

Therefore, any innovation introduced into the religion implies that Islaam is imperfect
and incomplete.

2. It necessitates the slandering of the Sharee'ah (Islamic Law); that is, it was incomplete
and the innovator has therefore completed it.

3. It requires the slander of Muslims who are not innovators, since by implication whoever
came before these innovations, their religion is incomplete; and this is dangerous.

4. Most people who were preoccupied with innovation, neglected the Sunnah. The Salaf
(our predecessor Muslims) who were adherents to Islaam, said: "Whenever a people
introduce a Bid'ah (an innovation), they destroyed its counterpart in the Sunnah."

5. These innovations also, bring about division among Muslims because the innovators
believe that they are the ones who carry the truth and that those who do not follow them
are mislead. However, the people of truth claim: "you are the ones (the innovators) who
are on the wrong path and hence this is their division".

There are serious deviations which result from innovation, for innovation is connected with
'a rotten mind and flawed religion'. (Al-Muhaadaraat As-Saniyyah on the interpretation of
Al-'Aqeedah Al -Wasitiyyah, 2/713).