How do we know the the soul is the only way we can live forever?

Tell me, have you ever studied quantum physics?

The air you breathe is there, and it exists, the only thing is, you can't see it? Is that clear?

And so is the human soul, it exists, and is inside your body, which is immortal!

So, the soul uses the body to interact, man is made up of a physical body and his Soul, which would be himself, in the spirit stage.

Therefore, the soul, put together with the body form one thing, with the difference that, when the body dies, the soul comes out and goes into the dimension that God has prepared for all, awaiting His judgment.Therefore, after your death, with your body, You, who are soul, come out of the body, and it is always You, the only condition is, that you do NOT have the body anymore, you remember everything you left on earth, and you will remain Soul until God will make the resurrection of the new body, then, He will unite the soul inside the body, and the body will become Immortal too.

@.--->River Euphrates: The proofs you will have when, from this life, you pass to the other, in the immortality of the Soul, you will see yourself thus, when you leave your body, then, you will believe.

"Robert" answered in a very clear way, the air exists, you feel it, you can breathe it, however you don't see it?

If you have never studied quantum physics, is it for the simple reason that many times you stayed in elementary school, several years, because you could not understand the lesson? LOL.

There is no evidence to support the existence of 'souls'.

Your desire for there to be 'mysteries' that have 'no explanation' is simply the 'god of the gaps' argument.

I like how 'Robert De Angelis-Italy-United States' invokes 'quantum physics' before resorting to the 'you can't see air but it exists' trope -  because nothing lets you know someone doesn't understand quantum physics better than when they try to apply it to something that can be proven using a grade-school science experiment.

Through the word of God. Ref the Epistle of John 1st chapter. 

The soul is the spirit within the body that cannot die, it can only be destroy by God.

Jesus said:  And fear not them that kill the body, but are not able to kill the soul.  But rather fear HIM who is able to destroy both soul and body in hell (the lake of fire.)

Because goat herders from 2,000 years ago told us so.

Because the scientific method is the only way to prove anything, dummy. How else are you going to prove something? What you just said is anything that can't be explained by the scientific method means Goddunit. Duh.