Well I think they would all understand each other. Example: Jesus use a cup to represent the flesh,in Tao they say shape the clay in to a vessel,or a pot or a jar is used. Jesus say the wind blows wherever it please you hear the sound it makes but you do not know where it comes from or where it is going.

It is like this with every one born of the spirit. They are like the wind. Buddha say where does the fire go when it has gone out? You see they use different word and analogies to speak about the unspeakable.

The logia is more important then the words in themselves. I will give you example, what word would you use to explain something to someone when that that you speak about has no words in existence to speak about it? You would have to find something similar and logical to explain it using the right words to not put people in error, so you would use thing that they know about like casting stones (physical action) but inside the cup judgement.

If you remember that was how it was under the Pharisees. But until someone experiences it for him self often he cannot understand it. Muhammad taught to do to others what you would like them to do for you. If the role would be inversed, in mind speak and action.

If I am not mistaken, Jesus said why do you do what you hate? why judge? they do the same and you will be judged by the measure you use. Zoroaster was a priest from the light of the sun. Jesus was the light of the world. Krishna and Buddha are very similar also. They where all masters in their time, or if you prefer teachers, that sought the truth about spirit (light), water (soul), flesh (physical body). so I think they would be in harmony and learn and help each other, and share the light of Truth.

they would reminisce on how shortly afer leaving their physical body behind after death, that their charge as a human beings became misinterpreted by the human inhabitants of earth. no doubt, all but Jesus, discuss that frequently when they gather in Paradise. not that Jesus did not possess a human body, but that His core was divine while the others were of spirit

In one unanimous unspoken voice, they'd say, intuit, emote:

"Welcome to the I meets I convention ♥"

Maybe they are the same Spirit, who incarnated in different cultures in different time to show the Way. They basically had the same teachings in some shape or form, the essence was the same, but it was different in every region because people had to resonate with the teachings, so different terms and stories were used so everyone could understand. Or maybe they are not the same Spirit, But its sure they come from the same place and had the same goals, to help us evolve :)

If they all got to gether, they would be looking at earth laughing like crazy saying - look at all these foolish people that are ruining earth with all their false religious beliefs that they have created and falsely using it in our names.