There is no trust more sacred to biblical faith than the injunctions to care not only for our immediate families but also the larger family of all humanity. We are commanded to "Honor your father and your mother," and care for those in need.
When he refers to "biblical faith" it would help if he'd quote specifically what the Bible says about caring for those in need, just in case anyone's skeptical that a national payroll tax-based pension system is specified.
But at this time, with Social Security and basic supports for all people at risk, we must raise a prophetic voice about national commitments.
He might also want to cite what in the Bible shows that their voices are more "prophetic" than the voices of people who disagree with them.