Ibn Taymiyyah on those who claim to posses fiqh
"...And there is another group, a people who do not know the 'aqeedah of Ahlus-Sunnah wal-Jamaa'ah as is obligated, or they know some it and are ignorant of some of it. And that which they know of it, they conceal and do not clarify it to the people, and they do not forbid from innovations nor do they censure [or critise] and punish the people of bid'ah.
Rather, they may censure [or criticise] the speech concerning the Sunnah and the foundations of the Religion absolutely.
Indeed they do not differentiate between the saying of Ahlus-Sunnah wal-Jamaa'ah and the saying of Ahlul-Bid'ah wal-Furqah, or they condone everyone upon their various differing Madhhabs, just as the 'Ulamah accept the positions of Ijtihaad which are allowable in the matters of differing.
And this is the condition of many amongst the Murji'ah, some of those [who claim to] possess fiqh, the Soofees and the the Philosophers."
(Majmoo' al-Fataawa, vol. 12)