The Jerry Falwell Library provides you with access to numerous nursing databases. Each database provides a unique search experience and provides different scholarly materials. If you need medical literature, with components that go down to the cellular level, top databases include PubMed, PubMed Central, CINHAL, MEDLINE Ultimate, and DynaMed (best for reference and background information).
For resources related to the intersection of Christianity and nursing, consider looking for resources in the Journal of Christian Nursing or the Christian Periodical Index.
These resources have significant sub-sections of evidence-based research.