I want to write a story in another language but I only know English. I'm considering just Google translating my text to a different language. Is this a bad idea?

I've always felt like it'd be cool to have a story written in a language like French, where it might sound more romantic. Or Japanese, where it might seem more artsy. The problem is, I only know English.

But then I got the idea... what if I just Google translate everything I write to another language? Thoughts? Have any of you ever done this for an entire novel?