Thomas knew the Lord Jesus was God :
John 20:28-29 KJV
And Thomas answered and said unto him, My Lord and my God. [29] Jesus saith unto him, Thomas, because thou hast seen me, thou hast believed: blessed are they that have not seen, and yet have believed.
Peter believed the Lord Jesus was Lord of all:
Acts 10:36 KJV
The word which God sent unto the children of Israel, preaching peace by Jesus Christ: (he is Lord of all: )
Peter preached that Jesus is God:
2 Peter 1:1 KJV
Simon Peter, a servant and an apostle of Jesus Christ, to them that have obtained like precious faith with us through the righteousness of God and our Saviour Jesus Christ:
Paul preached that the Lord Jesus was God:
1 Timothy 3:16 KJV
And without controversy great is the mystery of godliness: God was manifest in the flesh, justified in the Spirit, seen of angels, preached unto the Gentiles, believed on in the world, received up into glory.
Paul preached that The Lord Jesus is the great God:
Titus 2:13 KJV
Looking for that blessed hope, and the glorious appearing of the great God and our Saviour Jesus Christ;
Paul said that The Lord Jesus is the God and Saviour of whom appeared to us:
Titus 3:4 KJV
But after that the kindness and love of God our Saviour toward man appeared,
John explained that the Lord Jesus was God several times...
John 1:1 KJV
In the beginning was the Word, and the Word was with God, and the Word was God.
1 John 5:7 KJV
For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one.
1 John 5:20 KJV
And we know that the Son of God is come, and hath given us an understanding, that we may know him that is true, and we are in him that is true, even in his Son Jesus Christ. This is the true God, and eternal life.
So you see, there is scriptural evidence throughout the Bible to explain that the Lord Jesus is equal to the Father and is God.
There are THREE that are in Heaven... The Father, The Word and the Holy Spirit and these THREE are ONE.