* Conversion is a big mishmash in the Jewish religion because there are three kinds of conversions: Reform (which sometimes seem to happen almost instantaneously), Conservative (where you must study for 6 months and learn Hebrew), and Orthodoxy, which involves more study and for which you have to have nothing in your life to keep you from theoretically observing all 613 commandments or the ones that apply to you. And not every kind of conversion is acceptable to other Jews; only Orthodox conversions are accepted by Orthodox, for example.
Somehow it all sounds quite reasonable, although sorting out doctrines of belief have always come easier to me than legal doctrines. I was referring to the Law of Return (from what I could get in "Jewish Civilization", Chartwell Books 1997) but legal doctrines have to first please the electorate. Making sense is nice too of course, but not mandatory.