Resist the devil (from aboard the Ark) with the weapons of Prayer, Fasting, Sacrifice and Penance.
"But prove all things; hold fast that which is good." Traditional Catholicism is a proven good, the Faith of multitudes of Saints, so hold fast to it.
"But doing the truth in charity, we may in all things grow up in him who is the head, even Christ".
I guess it gets back to whether one believes that the current “Ark” is the True Ark.