The Bible does not condone slavery; it talks about how slaves ought to be treated (well) and how you should behave if you are a slave.
"I tell you the truth, everyone who sins is a SLAVE to sin" (Jn. 8:34). Since "the wages of sin is death", bondage to sin is the worst of all forms of slavery.
As far as not eating shellfish, that was a law given to the Hebrews only. They had a long list of laws to do and not do, but it applies to no one else except Hebrews.
Just goes to prove....a little knowledge is a dangerous thing.
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