Abdullah b. 'Umar - Allah be pleased with them both - said:

Every bid'ah (religious innovation) is misguidance, even if people think it is good.

Al-Lālakā'ī in Sharh Usūl I'tiqād Ahl Al-Sunnah wa Al-Jamā'ah Vol 1. P134, no.111; and Ibn Battah in Al-Ibānah Al-Kubraa Vol.1 p219, no. 213