Trinity Christian belief is expressed in the Qur'an as a clear evidence of exaggerated beliefs. Stating the criteria of exaggeration phenomenon, Quran rebukes the idea of the Trinity and also frightens the Islamic nations from the danger of falling down into the exaggeration abyss. Since in the field of Shia beliefs, the exaggeration phenomenon has emerged in some time and some Shiite movements, in this paper by referring to Quran, some criteria of exaggerating behavior are obtained in the domain of believes. Although all Shia community fail to use exaggeration, but it seems that the ideas of those who exaggerate has penetrated in the Shia community. By referring to Quran and learning the history of Christianity, Shiite will be insured against the danger of exaggeration.