That may not happen now.
The Cincinnati Zoo & Botanical Garden and the Creation Museum have made a joint marketing agreement and are selling "combo tickets" to get into both attractions for one price.
From the Cincinnati Zoo's website (link available from PZ's article):
This holiday season, save more by visiting two of the areas fantastic attractions. Cincinnati Zoo and the Creation Museum. Ticket is valid for one day regular admission to each attraction plus the holiday events PNC Festival of Lights (Nov. 28-Jan.4) and Bethlehems Blessings featuring a live Nativity scene(Dec 12 Jan. 4)
Save more with our new Combination Attraction Ticket:
Cincinnati Zoo & Botanical Garden and Creation Museum The Creation Museum, located seven miles west of the Cincinnati Airport, presents a walk through history. Designed by a former Universal Studios exhibit director, this state-of-the-art 70,000 square foot museum brings the pages of the Bible to life.
I am truly distraught.
[Edit] Whew! Looks like that's been scuttled. Now I can go there with a clean conscience.