Sometimes Worship Leads the Worshipper to the Fire (Of Hell)

Abu Basir has narrated from Imam Ja'far as-Sadiq (a.s.) that he said, "On the Day of Judgement a person would be brought forward. He had performed namaz in his life. He would be told that you have prayed but your intention had been to show-off, so that people may appreciate your worship. This person would be cast into the fire. Then a reciter of the Quran would be brought. He would be told, 'at the time of reciting the Quran, your intention had been to exhibit your sweet voice so that people may appreciate your tone.' This one shall also be tossed into the fire. The third person to be presented shall be one who had died a martyr in Jihad. He would be told that, 'Your intention while fighting was to make a show-off your strength and valour." He shall also be led towards the fire. The fourth person had been a charitable man. He would be told, 'your intention in giving charity was that people may call you generous.' Then he would also be led towards Hell.
(Layali Akhbaar).
Numerous traditions confirm that the Riyakaar person is a Mushrik. This is sufficient for the believing and the thoughtful people.