How can you teach something as scientific truth when you have no more real evidence than believers in ID have?
If you stripped away all of the evidence that supports evolution including the physical evidence, the evidence that 150 years without falsifying a falsifiable hypothesis adds, and the evidence that the successful application of an idea to daily life in a way that improves it adds - throw all of that out and the explanatory mechanism, and you would still have an idea that could compete equally with ID. They would both be ideas supported by nothing but faith.
I see design, complexity and beauty all around me. Design involves planning and planning involves intelligence.
A faith based confirmation bias allows one to see what only that which is already believed by faith. You begin with the assumption that there is an intelligent designer, and that is all that you can see. Everything that you think can be used to support that presupposition is emphasized, and all the evidence that you are wrong filtered out.
This is why the ID people keep seeing irreducible complexity in biological systems that are then later shown not to be irreducibly complexity. It's always the faith based thinker seeing something that isn't there because he assumes it is. This kind of thinking is antithetical to science and critical thought in general. If you don't go from all of the available and relevant evidence to conclusion using valid rules of inference (reason), you don't generate useful ideas about the world. You just generate unsupported beliefs that are subsequently used to sift through evidence. Use the opposite belief, and you keep the ideas you presently reject and reject those you presently emphasize.
This accounts for why somebody would take the fact that sunsets occur and are seen as beautiful to point to a god. The same sunset does not lead to that conclusion when reason is applied to the evidence. Reason (Occam's Razor)informs us to not add unnecessary complexity too our hypothesis. If we don't need a god to explain sunsets, we are not justified in invoking one.
Incidentally, your arguments from beauty and complexity are incredulity fallacies. You just don't see how such things are possible without a god, and therefore, they are impossible. That's a logical error. It remains possible that nature is natural.