Can religious faith be suspended and dropped under certain situations according to Shia branch of Islam?

I once saw some internet video discussing about essential differences between Sunni and Shia branches of Islam and I clearly remembered it mentioned Shia posits that one's religious faith (not the usual many different beliefs and knowledges) can be possibly suspended and dropped under certain situations such as imminent unavoidable harsh external causes or pressures while Sunnis don't accept such possibilities. I tried to find the exact source on internet but with no luck. Is there anyone here with sufficient knowledge can help clarify this difference in more detail?