Even if you rebook on other flights/airlines now, there is nothing stopping them from canceling the flights or changing departure dates/times between now and when you leave. With all of the problems in the airline industry, this is becoming a more common occurence. You should also consider trip cancelation insurance.

Since we are talking about a honeymoon, if you have enough time, what about starting over and having a real, local travel agent make the arrangments? You might pay a little more, but they will deal with all the hassles so you don't have to.