Have you read what the Bible teaches about slavery or are you simply parroting what others have said? As to the Sabbath, again you are showing your ignorance of what the Bible teaches.
Race and gender are genetic and homosexuality is not. Is it you contention that all behaviors should be tolerated and accepted if someone claims that behavior is genetic? As pointed out in a prior post some animals kill and eat their mates so I suppose we should legalize spousal abuse. How about male bears that kill the cubs of a female so the female will go into heat. If you are going to mandate animal behavior as right and proper where do you draw the line?