Changing your religious stance from what you used to know to be right is a sign of misguidance and falling into fitnah.
A Preserved State of Knowledge
It is reported that ʿAdī b. Ḥātim – Allāh be pleased with him – said:
You will remain upon good as long as you do not start approving of what you used to repudiate and as long as you do not repudiate what you used to know (to be right), and as long as your scholar (the knowledgeable) can speak amongst you without fear.
Ibn Baṭṭah, Al-Ibānah Al-Kubrā ḥadīth 26.
Also read
Related sayings.
A person of insight has deeper knowledge about some matters that others seem to feel safe from.
Fudayl b. Ayyad describes the true scholar (faqih) and what makes him talk, and what keeps him silent.