"All fowls that creep, going upon all four, shall be an abomination unto you.....but all other flying creeping things which have four feet, shall be an abomination unto you." Leviticus 11:20,23
There are no four legged birds (except mutations) and as far as I know, there aren't any four legged insects. Why would God have a prohibition against something that doesn't exist?
Reading this has shaken my faith in the Holy Scriptures
My friend you should not allow something so small, trite and simple to shake your faith. You will have a very hard time if in every debate you encounter with an individual your faith is shaken so much.
I think the response seems quite simple to me here:
A close reading of the passage will indicate that included with those four-legged flying insects which are forbidden are those which are not forbidden such as the locust, cricket and grasshopper. However, from what we understand of these insects they are not four-legged but actually have six legs, well according to modern day scientific classifications and definitions anyway. How can the passage refer to these insects as four-legged when obviously they aren't, well by our modern day scientific standards anyway? Obviously there must be some difference in definition here.
If we take another look at the text, it seems to differentiate between the feet of the insect and its legs - the legs being the hind legs with which it uses to leap as the text mentions. Therefore, if we add the two hind legs with the four front feet voila we have six feet/legs and problem solved.
I think the problem resides in trying to fit a text with a specific culture, geography, and time within our modern day scientific culture. Moses' intentions were to speak to the people in the language they understood and not in 21st century scientific jargon.