Is a "higher universal conscience" or God scientifically possible? A being above all the universe? Some people say that a high power is impossible while others say we have no proof to deny the existence of a deity or proof to support the idea. I wanna know that is it possible there could be a God. And along with that, could it be possible that there are souls and/or an afterlife.
Here is my opinion. The only way to acutally prove something true in the scientific sense is through the use of our physical senses. Our physical senses do not excede or "go beyond" the natural universe. Ecstatic and mystical experiences are usually explained easily with simple biology and psychiatry. Almost every definition of "god" contains something that is supernatural, same goes with the afterlife or the soul. So basically, when someone tries to use reason and science to "prove" the existence of something supernatural they are settting themselves up to fail. Our senses cannot experience something outside of the natural universe (i.e., supernatural) because our senses are part of this natural objective universe.
Most attempts to "prove" god or even rationalize the idea rely on a heavy dose of solipsism that are at best weak and at worse ignorant. Science cannot rationalize something that exists outside the natural order of existence, bound by its laws, because our senses that we use to understand and to explore are bound by the same laws.
So that kind of leaves a scientific explanation out of the question and (as mentioned above) leaves it the realm of speculation. Philosophy deals with the question with the classic (and now somewhat trite in my opinion) "arguments" for god's existence such as the teleological, the cosmological, etc. These can be read and refuted and re-argued over and over. There are a plethora of debates involving these arguments on youtube and other sites. The fact reamins that none of these arguments rely on scientific inquiry or hard evidence and so they fall a little flat in my book. The main arguments for god in common use today come from design (the teleological branch of theological speculation) and have created what some have called a god who fills in the gaps. It seems that whenever science cannot explain something (regarding the big bang, evolutionary gaps, etc.) then theologians jump to use god as an explanation. This is dangerous because as science goes further these gaps diminish. Christopher Hitchens once remarked that this leads "the heavens to get emptier every day."
So, as many many people have noticed, there is no argument for god's existence that is completely sound or scientific. It all comes down to whether or not a person is willing to accept something on faith alone. Could a god exist? Perhaps, but I highly doubt it after having went over the evidence pro and con.
As to comment about religious leaders, this is called the "call to authority" argument for god's existence. It doesn't really work because many great people who have changed the course of our species' path forward came from humble beginnings. Since Jesus was a poor carpenter's son (if he ever actually was a real person with a real message) and Mohammed was illiterate, that must mean they were divine to have changed our course so greatly, right? Not really. Mohammed's faith was spread mainly through conquest in the beginning. We can view Islam's success in light of great militiary might, not providence. Christianity also became the religion of a powerful empire and forced conversions through militiary force were common in the beginning. Entire countries were baptized into the faith. This argument is dangerous in my opinion because look at the success of certain streams of fascism or authoritarianism. Because of their power does this validate their leaders' wicked opinions on life? No, it doesn't. The mass spread of certain faiths and their influence on the world no more validate them than a long standing tyranny's call to its founder.
These are just my observations and opinions. To believe in a god or an afterlife require faith, a belief absent of physical evidence and scientific explanations. This doesn't work with me and I find it irrational, personally. Again, I think it has a lot to do with our solipsistic nature.