I was surprised Sal's #7 post didn't gain much traction; after reading the link to the actual bill (rather than the clearly partisan reporting of said bill), I find that there is no mention of God in the entire bill except in the name. Rather, the bill changes states for several sections: "The text of the oath required by paragraph (1) may not be changed except by Act of Congress."
But doesn't this force people to say the "so help me God" portion, you might ask? No, because this point of law is already established and per several army/navy/marine/AF regulations, you are not required to say the last portion of the oath.
Is Sam Johnson being an a-hole? Yeah, probably, and pandering to his constituents to boot. But even if this were to pass, there are still so many regs that allow you to avoid saying "so help me God".