Why could my belief be classified as?

I have left it said in this website that, Aliens do NOT exist, because those who have seen these supposed Aliens, in truth have seen the spirits of Demons, because they use their power of Mutants, to deceive human beings.
If you don't consecrate your brain and heart to God, you will go to hell, along with the Alien Spirits!
The picture of your dog, is it a Pitbul Labrador?

>I believe that an alien species genetically engineered man to make us who we are today.<


This would classify your beliefs as weird. 

I would classify it as unfounded, possibly delusional.

I would classify that belief as being "immature and misguided." 

"Why could my belief be classified as?" --- unintelligible 

'I believe that an alien species genetically engineered man'

That's called 'lunacy'.

Yes, biological evolution is of course a thoroughly understood natural process, even though some churches that have defected from the original Christian Church reject that fact because it disagrees with their misinterpretations of the Bible. However, the teaching of the true Christian Church never conflicts with natural truths revealed by science. Truth cannot conflict with truth. As for aliens, it's your fantasy, and has no supporting evidence whatsoever.
Catholic biologist

'without factual basis'?

Sheer idolatry for worshiping a god of your imagination. 

Psalm 14:1 
The fool hath said in his heart, There is no God. They are corrupt, they have done abominable works, there is none that doeth good.