YOU SAID:

I don't think anyone knows where ANYTHING came from.

INTO JAPANESE

私は何かがどこから来た誰もが知っているとは思わない。

BACK INTO ENGLISH

I do not think anyone from anywhere knows that.

INTO JAPANESE

私はどこからでも誰もが知っているとは思わない。

BACK INTO ENGLISH

I don't think I know anyone from anywhere.

INTO JAPANESE

私はどこからでも誰も知らないと思う。

BACK INTO ENGLISH

I do not think anyone knows from anywhere.

INTO JAPANESE

私はどこからでも誰も知らないと思う。

BACK INTO ENGLISH

I do not think anyone knows from anywhere.