do some research go here and read some of our view
http://www.kjvbible.org
As far as the comet thing I can go along with that.
you will noticed the window and doors of the Seas whether above or below were already established in the earth and in heaven. they were not created in the 6 day creation for surely God would have mentioned it. he only separates them by a firmament and separates them for land to appear in that case he calls it gathered the waters.
I agree there may have not been rain on earths until Noah's flood, just because the earth is covered in waters in Gen1:2 doesn't mean it got there by rain.