Databases search many journals at one time. When you are beginning your research it is a good idea to search through the general databases first. These search the most journals on the most subjects. After your search, make sure to narrow down the results by selecting the filter on the left hand side of the page that says "Scholarly" or "Peer Reviewed." There are other filters that you can use to narrow down the results based on when the articles were written, subjects included, and various other limiters.
When you've found an article that seems appropriate and interesting for your research, make a note of the subjects/keywords listed under the abstract to search for similar articles. You can also use those keywords and important terms when you search in other databases. When you are more comfortable with your topic, search through the databases that search specifically through journals that deal with religious topics.