There is a wide variety of information available on the Internet, some more reliable and applicable to academic studies than others. For example, using data from the Australian Bureau of Statistics may be highly relevant to some assignments, and is a reliable source. Some well-renowned scholars and Christian voices also host personal blogs to discuss their opinions, and these may also be reasonable to cite for assignments.
However, anyone can create a website and make it look official, so be careful with information found through a basic Google search.
When using a website as a source you need to include as much information in the footnote and bibliography as you have access to from the website.
If possible you should include: a title of description of the page; the author of the content; the owner or sponsor of the website; a URL; a publication or revision date. If no publication or revision date is available you should include the date you accessed the page.
1st citation
"Title of Webpage," author of content, owner or sponsor of site, publication/revised/access date, URL.
“Why Theological Study is for Everyone,” Jared C. Wilson, accessed January 6, 2016, http://www.christianity.com/theology/why-theological-study-is-for-everyone.html.
Subsequent citations
"Title of Webpage."
“Why Theological Study is for Everyone.”
Author of content or owner/sponsor of site. "Title of Webpage." Publication/Last modified/Access date Month Date, Year. URL
Wilson, Jared C. “Why Theological Study is for Everyone.” Accessed January 6, 2016. http://www.christianity.com/theology/why-theological-study-is-for-everyone.html.