At the risk of echoing that guy that I'm accused of being the Catholic version of, I think the "biblical support" comes back to Jesus's actual teachings. I think most (hopefully all) of the denominations consider "essential" the stuff Jesus said. Where we depart are post-Gospel interpretations.
For instance, James's reference to "be doers, not just hearers" is an example of the faith/acts thing that has been so problematic.
Sincere effort to follow Christ is, to me, the basic definition of "Christian."
For instance, James's reference to "be doers, not just hearers" is an example of the faith/acts thing that has been so problematic.
Sincere effort to follow Christ is, to me, the basic definition of "Christian."