agnosticism        
noun [ U ] uk/æɡˈnɒs.tɪ.sɪ.zəm/ us/æɡˈnɑː.stə.sɪ.zəm/
 不可知论
the beliefs of someone who does not know, or believes that it is impossible to know, if a god exists
  According to census figures, men significantly outnumber women in claiming agnosticism. 人口调查数据显示,宣称自己相信不可知论的男人要比女人多得多。 
 My agnosticism is easily explainable: I can't prove that God exists, and I can't prove that God does not exist. 我的不可知论立场是很容易解释的:我既不能证明上帝存在,又不能证明上帝不存在。 
 - More examples
 - He was moved to question his own agnosticism.
 - You may think that agnosticism rejects all beliefs, but the opposite is the case.
 - The president has described her agnosticism as a justifiable desire to ask questions.
 - Some would see his agnosticism as the only true basis for religious faith.
 - There seemed to be a kind of scepticism or agnosticism about human rights that I found horrifying.