Q. Why doesn't this article give equal weight to young Earth creationism or similar cultural points of view?
A. This article focuses on the scientific consensus about the Earth. Per our policy on fringe theories and pseudoscience, fringe theories about the Earth need not be given equal weight. Such views normally have their own well-developed articles where there is more weight given to presenting the specific philosophies.
Q. Why is the Blue Marble image used in the infobox?
A. There are multiple reasons. The image is iconic, famous and is one of the few true photographic images of Earth. It has also been a featured image since November 2004. Other images may present more detail of the land masses, but they are generally composite or processed images. For some previous discussions see (1 2 3 4 5 6 7).
Q. Why does the article not have mostly harmless as its short description or otherwise summarize the article's content using it?
A. This has been discussed several times including (1 2 3 4 5). The consensus is that it fails WP:42.