Bottom line? They have nothing!
Not only do they have nothing, they still vainly attempt to refute scientific evidence that undermine their credibility and views.
My personal favorite example of that was the Lenski Affair, which is documented in detail on Rational Wiki:
Lenski affair - RationalWiki
This was in reference to the experiment that Dr. Lenski performed regarding evolution in bacteria. Naturally, this flew in the face of Creationism so another famous Creationist nimrod, Andrew Schlafly, the creator of 'Conservapedia', tried to counter his claims. The most laughable aspect was his insistence on getting the 'raw data' to try to confirm Lenski's findings. Lenski continued to indicate that all their data was in the research paper. But Schlafly continued to persist whereby it became apparent he was actually asking for the bacteria itself. Lenski finally replied that they are happy to share the actual 'raw data', i.e. the bacteria, but that this needs to be handled properly and in a lab environment. Which obviously Schlafly didn't have.
Definitely a humorous exchange and was even mentioned in Richard Dawkin's book 'The Greatest Show on Earth'. But ultimately, once again, Creationism failed miserably and made a mockery of itself.