YOU SAID:
I can't believe God was exist
INTO JAPANESE
神が存在していたなんて信じられない
BACK INTO ENGLISH
I can't believe that God existed
INTO JAPANESE
そんなことは信じられない。
BACK INTO ENGLISH
I can't believe that.
INTO JAPANESE
そんなことは信じられない。
BACK INTO ENGLISH
I can't believe that.
That didn't even make that much sense in English.