G'day. Welcome to WikiChristian. Thanks for pointing out a factual error in Evolution section of the Creation article. If you see an error, feel free to go right ahead a fix it up.
With regards to your question about rules for editing the site, well, there aren't any set rules that absolutely must be adhered to. However, for any given topic, the main page should ideally be written to convey information and facts - so if there are various differring views within Christianity on a topic, then the views should be stated and arguments for and against explained. As a general rule, you can assume that this Statement of Faith is true, and write from this perspective without having to justify it.
When is a denomination considered to be Christian at WikiChristian? A denomination is considered Christian if it adheres to these Wikichristian:Beliefs - hence, all the denominations that are traditionally considered Christian (such as the various Protestant denominations, Roman Catholicism and Eastern Orthodoxy) are Christian for the purposes of WikiChristian. Likewise, all the denominations that are traditionally not considered Christian, such as Jehovah's Witnesses, Christadelphians and Mormonism, are not considered Christian at WikiChristian.
Although the main page for any topic should be factual, feel free to write a more opinionated article - see Wikichristian:Opinion articles
Hope this helps. We'd love to see you help out and edit, --Graham grove 16:36, 21 September 2007 (EST)
PS - Where to help? Anywhere really that you have an interest in or some knowledge to add. Some opinion articles would be excellent if you had the time. Helping out with Biblical commentaries would also be a great help - see Bible Changes#How can you help? for some details. Other alternatives would be adding content to some of the more important topics in Church history, Denominations and Doctrine. --Graham grove 16:43, 21 September 2007 (EST)