In the era of Imamayn Al-askariyayn (peace be upon them), there were a lot of wrong opinions and believes. In this situation for manifesting the truth, this wrong opinions should have been expressed. When Imamayn Al-askariyayn (peace be upon them) had took the opportunity to express the truths, they proceeded to revealing truths and rejecting doubts. This essay is a glimpse at sects, religions, and strands of thoughts in the era of these Imams. After a short definition of each sect, we mention the traditions (Ḥadith) relating to them and remark the attitudes of each Imams about them. In this era, we see sects and religions like Gholat, Sufism, Waqefiyah, Jabriyah, Mojasamah, Thanawiyah and strands of thoughts like the belief that the Quran is created by man. One example of the analyzing attitude in this research is this belief, which Imam Hadi (PBUH) preferred silence and reservation, but in the era of Imam Hasan Al-askari (PBUH) this dilemma was removed and nobodies' life was in peril, so he expressed frankly that the belief the Quran is created by man is a mistake. Declaration of these two Imams′ viewpoint caused awareness of people and prevented them from being deceived. Also, it led to opprobrium of the leaders of these sects and religions.