YOU SAID:
I can't believe it is that bad
INTO JAPANESE
私は悪いことだなんて信じられない
BACK INTO ENGLISH
I can't believe that bad
INTO JAPANESE
私は悪いことを信じることができません。
BACK INTO ENGLISH
I can't believe the bad things.
INTO JAPANESE
私は悪いことを信じることができません。
BACK INTO ENGLISH
I can't believe the bad things.
That didn't even make that much sense in English.