"..your 99+% argument...is that not an argument from authority, another logical fallacy?.. "

NO! Argument from authority is simply claiming that someone is right in one area because they are famous in another area.
Example.. Dr. Linus Pauling, a reknowned expert in some areas of chemistry, asserting things about vitamin C. There is no doubt that vitamin C is important and useful, but Pauling had only personal anecdotes and an opinion about health issues.

It is a fact that we need 'authorities' in each area to guide our knowledge. Sometimes they disagree, and more data is needed... but when 90+% of experts in a specific area do agree, and their analysis is corroborated by other experts in other areas, we need to pay attention. This is especially important when the 5 or less % disagree because of shoddy reasoning and dubious interpretation of data. When a guy with a degree in geology chooses to deny the data most of his colleagues accept, we have reason to be skeptical. He is free to suggest why certain geological theories need to be examined, but NOT because of his religious premises!

"...the consensus has often been wrong." But not usually... there are good reasons for having a consensus. The supposed 'scientists' who contribute to Creation.com are only scientists in so far as they follow the scientific method. When they warp the data to support religious beliefs, they are not acting AS scientists.