The content created for promoting Christianity should be relevant to the age group it is for.
Using imagery, audio, and video that an age group can relate to also helps them better understand and appreciate what they are viewing/using.
When making a website or generating some form of content to promote Christianity, the relevance to the age of the users is key. For example, an app for young Christians should feature images that help them relate to and understand the content. Using imagery, audio, and video that an age group can relate to helps them better understand and appreciate what they are viewing/using.
Writing style is also a part of relevance. Content for a younger audience should use a more modern writing style. The topics of the content is yet another factor.
Finding ways to connect Christian ideas with life examples relevant to the age group they are for also helps that age group make sense of what they are reading and find more meaning in it. However, none of the good of Christian teachings should be lost in translation. Content can be created in a contemporary style, for example, while still staying true to Christian teachings.