An interesting point of discussion which we are trying to figure out something that cannot be described unlike the last two topics which physics being the answer by reasoning.
Firstly, let us try to understand first the noble concern of our brothers and sisters which we label them; "Atheist". (They don't like to be labelled actually, as it defeat the purpose of their stands against the religions). Correct me if I am wrong, Mr. Sam Harris, the intention of the atheist is to throw away the practice of division among humanity due to this "religion". I am quite agree with the fact that the "religion"s today being the point of humanity diversion from the peace.
The reason I highlighted on the view of atheism as above to get a full attention that the discussion shall not be skewed towards any contemporary standard belief system, yet to find the path towards peace for humanity as the discussion of spiritual aspect often being the source of argument and prevention of further thinking avenue.
Lets see what Quran says describing a pious person in Al-Baqarah, 2:03; "Who believe in the unseen, establish prayer, and spend out of what We have provided for them,", which constitutes that believing in the unseen is a must, and if it a must, the logic is, it EXIST.
In the Bible: 2nd Corinthians 4:18;
"While we look not at the things which are seen, but at the things which are not seen: for the things which are seen are temporal; but the things which are not seen are eternal.", an interesting phrase of which describes the physical being is temporary but the spiritual is infinity.
Now, lets re look the understanding of "orbital theory" in my previous article on the physical form, which the foundation of the discussion is on Gravitation. Let's see the further description on Gravitation as Quoted from Wikipedia:
"Gravitation, or gravity, is a natural phenomenon by which physical bodies attract with a force proportional to their mass. Gravitation is most familiar as the agent that gives weight to objects with mass and causes them to fall to the ground when dropped. Gravitation causes dispersed matter to coalesce, and coalesced matter to remain intact, thus accounting for the existence of the Earth, the Sun, and most of the macroscopic objects in the universe.
Gravitation is responsible for keeping the Earth and the other planets in their orbits around the Sun; for keeping the Moon in its orbit around the Earth; for the formation of tides; for natural convection, by which fluid flow occurs under the influence of a density gradient and gravity; for heating the interiors of forming stars and planets to very high temperatures; and for various other phenomena observed on Earth.
Gravitation is one of the four fundamental interactions of nature, along with electromagnetism, and the nuclear strong force and weak force. Modern physics describes gravitation using the general theory of relativity by Einstein, in which it is a consequence of the curvature of space-time governing the motion of inertial objects. The simpler Newton's law of universal gravitation provides an accurate approximation for most physical situations."
In other words, gravity is an "unseen yet exist" force that responsible to keep the order of the physical form i.e. the nature of any physical matters which the smallest part we know is the atom and the biggest... limitless. In essence, the existence of any being/tangible matters (includes human) are basically and significantly a must to have both elements, the physical form (seen) and the gravitation force (unseen). With only one element, we can simply said... we shall not exist.
Let us further examine the significant of this unseen force. Imagine what would happen IF the sun changes its gravity force only by reducing 1% of it? The world shall become further 1% from the sun, lesser gravity on earth, lower temperature; in conclusion, just imagine the destruction.
With this, we shall understand that every physical forms/being/matters are in need to "manage" its gravitation power, the orbital force for the sustainability of its existence towards its purpose of existence. Another words that described this is the "law of nature". 2 hydrogen and an oxygen will in this law be a water and it has it own purpose of existence, you know it. Playing around with this force or spiritual matter shall creates disorder in this law of nature and it became unsustainable.
Let us see in our world of humanity, this unseen force which connects us, we call them; LOVE. Love is the only bond we have for humanity, the differences is only in terms of its nature to conform with its existence. each atoms cannot freely combined as it will, it has certain rules to follow for it sustainability. there are a lot of combining methodologies for atoms which we concluded in the science of chemistry and physics as bonds (ionic and covalent bonding). Same thing applied to us, we can have the same love to everybody on earth but the actions/practices against each other shall based on its law. We cannot treat our colleague as our spouse or our children etc. This is why we cannot have a marriage bond between same sex as it defeat the purpose of nature in reproduction. Yes, the love between same sex exist yet it in brotherly nature, similar as how atom with same or almost similar attributes cannot be combined with in ionic bonding (ionic bonding means transfer of electron charges to its "neighbour". Same positive charged ions can combined by sharing the negative charges in its electron cloud... you know what I mean.
This bond/gravity/unseen force is LOVE. I strongly believe that. In the scripture of God, that is the first attributes of God being mentioned after His ruling power over the universe (ar-Rahman).
Can you see it?
Embrace the love.