One who takes a vow to satisfy Lord Śiva or who follows such principles will certainly become an atheist and be diverted from transcendental scriptural injunctions.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
भवव्रतधरा ये च ये च तान् समनुव्रताः पाखण्डिनस्ते भवन्तु सच्छास्त्रपरिपन्थिनः
bhavavratadharā ye ca ye ca tān samanuvratāḥ pākhaṇḍinaste bhavantu sacchāstraparipanthinaḥ
SB 4.2.28