While a background image will only change your page's background to a Christian theme, a complete template will add special font styles and sizes, a header image and customized borders to your entire profile.
Spoiler etiquette on most Internet sites and message boards requires a SPOILER! warning be posted in the header or at least several spaces between the beginning of the message and the actual spoiler.
Simply select edit this page from the drop-down toolbox, type in your question below the Ask Your Kids Question Right Here header, and click the Save Page button at the bottom of the page.
If all you want is a better keyword for your blog header, you can hire a company like SEO7Services to work on that, or any of the other many options they offer (far more than seven).
Themes usually include two components - the values that customize your page's background, fonts and border styles and values that specify how the page's header or marquee appears.