YOU SAID:

The important thing is he believes it.

INTO JAPANESE

重要なのは彼がそれを信じているということだ。

BACK INTO ENGLISH

What matters is that he believes it.

INTO JAPANESE

重要なのは彼がそれを信じるかどうかです。

BACK INTO ENGLISH

What matters is whether he believes it or not.

INTO JAPANESE

重要なのは彼がそれを信じるかどうかです。

BACK INTO ENGLISH

What matters is whether he believes it or not.