In this case "like" is fine, because it's used to introduce a comparison. Buddha is a term similar to king or priest. "Like" is only a problem on the GMAT if it is used to introduce examples. So this sentence would be incorrect:
People in positions of authority, like kings and priests, sometimes have feet of clay.
The correct version:
People in positions of authority, such as kings and priests, sometimes have feet of clay.
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