But in the scientific realm no one really ignores potentials concerning higher being. For instance: how much has been spent on the search for Alien life?
Aliens are not a "higher being". They would be natural beings just like us.
Your misunderstandings may be due to a major difference in worldview. You have decided that one potential is important to study because of its emotional appeal. That is not how science works. Potential explanations in science are weighed by their explanatory power, not their emotional impact. "Higher beings" offers no explanatory power where science is concerned. You might as well ask why forensic scientists do not consider the potential that Leprechauns plant fingerprints at crime scenes.
Do you think it is possible you live inside of a living thing?
What evidence would lead us to this conclusion? What experiments could we possibly run to test this theory? How does this explain anything?
Is it arrogance of man when mankind sets themselves to be the most intelligent thing in the universe because we figured out how some of it works?
Is it arrogance of man when mankind asserts that there are higher beings simply because they want it to be true? Is it arrogance to think that out of all the things in the Universe that we are the goal of the whole of creation, and that the creator of the Universe actually cares about our day to day struggles? Is it arrogance to ignore scientists who tell us that we are not the center of the solar system?
Science wants to know everything, and scientists do too, but what scientists do not want to know is if there is a higher being?
What scientists want to know is what is going on in reality. If a higher being is having an effect in reality then of course scientists want to know about it. The only problem is that there is no evidence for this.
You have plenty of cannon fodder here, but how about simply answering this one question: Is higher being a possibility?
Does it matter if it is a possiblity? Is it possible that Leprechauns plant fingerprints at crime scenes? Is it possible that invisible unicorns create clouds? Is it possible that fairies cause gravity? We can spend all day describing possibilities, but what is the use?