dogmatism

dog|ma|tism /d'ɒgmətɪzəm, AM d'ɔːg-/
[N-UNCOUNT]
If you refer to an opinion as dogmatism, you are criticizing it for being strongly stated without considering all the relevant facts or other people's opinions.
We cannot allow dogmatism to stand in the way of progress.
dogmatist [N-COUNT]
Intellectuals are becoming unhappy with dogmatists in the party leadership.