[Drywall DIY Guy]

Yes, as mentioned, let it breath. Otherwise, moisture can build up since the vapor from your living space will condense when it hits cold temps. Then the moisture dampens the insulation, causing it to perform poorer and possibly leading to mold. Damp insulation has less tiny air pockets, and air pockets make a nice insulator in themselves. So take the paper off. A moisture barrier should only be placed right next to the heated surface - this stops moisture from getting into your insulation.