Originally Posted by
habilis
As with the OP's post, I'll assume you are serious and point out that soap, although slippery, contains a de-greaser (lye). I doubt that commercial bearing grease has lye in it. Also, soap is intentionally water-soluble - not a desirable property in grease.
You might have clicked through the wiki-link from post no. 5, but you didn't.
Grease generally consists of a soap emulsified with mineral or vegetable oil.