My Lord And My God

Why did Thomas say to Jesus, "My Lord and my God!" (John 20:28)?
He "answered" (John 20:28) Jesus, who told him, "Do not be unbelieving, but believing” (John 20:27, see Thomas the Twin).

What did Thomas believe Jesus to be?
"God": “My Lord and my God!” (John 20:28)

If Jesus wasn't God, what would He have done to Thomas?
Jesus would have rebuked Thomas for calling Him God.

What does Jesus' response above to Thomas indicate?
Jesus concurs with Thomas' statement that He - Jesus - is God.

How does Jesus’ resurrection prove that He is God?
Imagine someone says and does great things for three years, claims to be God and that he will die to pay for our sins, then rise from the dead. If he then dies and stays dead, he remain someone who said and did some great things but was delusional. But if he does rise from the dead, then he validates his claim of being God. If Jesus did not rise from the dead, He wasn't God, the Bible is a lie, and this study is a waste of time.

Did Thomas say to Jesus, "My Lord and my God!" (John 20:28) after touching Jesus’ scars as Jesus invited him (see Thomas the Twin)?
Jesus told Thomas, “because you have seen Me, you have believed" (John 20:29); Jesus didn't tell Thomas because he has touched Him, he has believed, and there is no mention of Thomas touching Jesus' scars anywhere in the Bible. So, despite a scene made popular by Roman Catholic paintings, Thomas saw the resurrected Lord, heard Him, and then declared, "My Lord and my God!" (John 20:28)

Will you ask to touch His scars before making that declaration?
 

Why was this gospel written?
"These are written that you may believe that Jesus is the Christ, the Son of God, and that believing you may have life in His name" (John 20:31).

Are the "many other signs" that Jesus did but "are not written in this book" (John 20:30) lost for good?
We will hear about them in heaven.