“相信别人不相信的”用英语怎么说

believe what others do not believe.
这是个名词性的从句,不过很好理解,用定语的不是很舒服吧
believe the thing that others do not believe这样就可以了,只是believe后面多了一个宾语而已,从句修饰宾语

Believe in what others don't belive in.

Do believe that others don't believe.
强调了下。

定语从句：
Believe things which others do not belive.

其实最地道的英语这么说好：Believe what others do not believe.

本句用从句很好
Trust things what others don't trust

Believe what others don't believe.