There are many other exciting possibilities. Online games are very popular. Simple games can be a value-added option to encourage return visitors. Cartoons and humor can infiltrate truth past people's defenses. Comic stories also have great potential.
Sites can offer help for specific health or emotional problems in a gently evangelistic way.
An evangelistic web-site will generate email questions from readers, so you need a strategy to handle them. A popular site may require volunteer email helpers. Running a web-site can be very time consuming . Maybe retired missionaries or ministers could help. There are also good Gospel presentations and evangelistic sites to advise your visitors of.