Florida Sen. Marco Rubio attempted to walk the line between science and faith-based creationism in remarks that that have provoked the ire of liberal blogs, leaving the door open to creationism in responding to a recent question about the age of the Earth.

When GQ’s Michal Hainey asked Rubio, in an interview released Monday, “How old do you think the Earth is,” the rising Republican star described the debate about the planet’s age as “one of the great mysteries.”