Pretending to be Spiritual --- Keep Away from Them IMMEDIATELY

Always try to follow the moral path, the spiritual path. There are people who have no sense of impurity; the more they commit wrong, the more they become callous. All their moral sensitiveness is destroyed. They have no sense of shame. But a true aspirant is highly sensitive to the moral sense. Vyasa in his commentary on Patanjali's Yoga Sutras compares the mind of a yogi to the eyeball. Just as the cornea reacts immediately to even a speck of dust that falls on it, so the mind of a Yogi reacts strongly to the slightest thing that causes sorrow. 

Without such a sensitive and alert mind, spiritual life is likely to end up in a disastrous failure. Purity of mind is inseparable from spiritual life. If you see people pretending to be spiritual while leading impure lives, keep away from them. Do not believe the claims of impure people regarding spiritual experiences. 

Source: pg. 172, Meditation and Spiritual Life by Swami Yatiswarananda