In what? You can't assign any description to what you believe in? Do you realise how ridiculous and stupid that is, if taken literally?
What you mean to say is that you do have plenty of things to say in regards to describing what you believe but that doesn't completely describe what you believe. I hear plenty of Christians say their god can't be described yet they then talk about the god of the bible and his views and behaviour and intentions and attitudes. So clearly they can describe what they believe it sufficiently to distinguish it from other religions or Santa or unicorns or the creature from South Park posted further up in this thread.
If you literally cannot say anything, ANYTHING, about what you believe exists then you're either lying or an idiot.
You're either under the influence of medication/alcohol or in need of said medication. The fact you're always like this suggests you're either a massive addict or not taking enough medication. See a doctor.