Yep, there are people with practically the entire alphabet after their name who say global warming is a myth, the earth is 6000 years old, evolution is false and aliens are abducting texans and probing them. I don't believe them either.
Global warming - people point to the lack of evidence that it is happening. They fail to understand that true evidence on this can only come counter-factually. That game is about prediction, not 'i observed X repeatedly and therefore we know Y will happen'. Not the way that research game works, there is uncertainty until it happens and only then can you be sure. until then anyone can say 'categorically prove it'
6000 years old etc - no academic in the world challenges the age of the earth, theological or not.
Aliens etc - astro-physicists have worked out the probability that they exist using complex mathematical models and basic probability theory. Its Billions and billions to one on that they exist.
These physics boys put together a coherent argument based on known physics models, no conjecture.
I personally am ambivalent to the theory but they can not be dismissed in the way you have done although i agree with the sceptical sentiment regarding the overall question.
* Note to self - stop coming over as a bit of a t***.