Hi Libby, I was never a Witness. I think I know what you mean by "other religions" I became a follower of Jesus
in the Methodist church, married my high school sweetheart and joined the Baptist church with her, so I am pretty qualified to be "other". I think of myself as a follower of Jesus, not much of one, but I am one.
1. What do other religions think the 144,000 are or is? Jews
(John 10:16) other sheep I have not of this fold SO (Matt 10:6) go rather to the lost sheep of the house of Israel(Matt 15:24) I am not sent but unto the lost sheep of the house of Israel. SO
(Rom 1:16) I am not ashamed of the gospel of Christ: for it is the power of God unto salvation to every one that believeth; to the Jew first,
(Rom 2:9) Tribulation and anguish, upon every soul of man that doeth evil, of the Jew first,
(Rom 2:10) glory, honor, and peace, to every man that works good, to the Jew first
NOW (John 4:21) the hour is coming when neither on this mountain nor in Jerusalem will you worship the Father.
2. I can find lots of information as to scriptures that show how God and Jesus can be the same. But if Jesus is God, how did he send himself to earth ? And how did he pray to God when on earth ?
The trinity doctrine is not meant to be a definition of God. This statement is the gist of it.
"do not confuse the persons, do not divide the substance" The father and son are not the same person.
The limitation of human thought and vocabulary is, what exactly is a "person"? Probably better is just
use the adjective and say they are personal. As for the English word "substance" it usually refers to physical
substance and God is not physical so commenters often use "essence" or "nature". Jesus had human nature
and divine nature. One person with two natures. Go on youtube and see experiments with light to see that
this is possible. Light has two natures, particle and wave. Father and Son have the same nature.
Jesus forgave sin, controlled the wind, and received worship because it was his nature. We don't care that
Thomas called him God (see Acts 14:11 and Thomas was just a regular guy) what we care is Jesus let
him say those words without rebuke but with a blessing instead (John 20:29).
The Holy Spirit is a person? Again better to stay with the adjective, personal.
the holy spirit said: “Set aside for me Barʹna·bas and Saul for the work to which I have called them.”
3. If God and Jesus are the same do other religions still ask their prayer in Jesus's name or do they just say Amen ?
Whatever it is that you do in word or in deed, do everything in the name of the Lord Jesus, thanking God the Father through him.