Why do theists so often use bad logic when trying to argue for their creator?

[dan the man]

NOT A TROLL OR INSULT. I honestly am wondering why so many theists make arguments from ignorance or authority, or use the cosmological argument and other such things when these all can be shown to be poor arguments over and over. If i say to someone, "Cats are better than dogs because cats have fur" and someone points out to me that is a bad argument for cats, I would say thanks for pointing that out and come up with a better argument.Yet time and again here and elsewhere I see theists using arguments that have been disproved even since the enlightenment. Honestly, why does this seem so common? How many theists here research their view and opposing views before coming to the conclusion that your own argument holds water?