No, an answer to the statement: "They will still be allowed to preach whatever they want and not face any legal action as long as it doesn't incite a riot or harm others!!!"Oh what an original strawman you have constructed here.
Keeping marriage as is, that's the moderate centrist position. Radically redefining marriage or criminalizing same sex marriage are the extremes.
Same sex marriage is Fin de siecle fad.