1 John 5:20Amplified Bible (AMP)
20 And we [have seen and] know [positively] that the Son of God has [actually] come to this world and has given us understanding and insight [progressively] to perceive (recognize) and come to know better and more clearly Him Who is true; and we are in Him Who is true—in His Son Jesus Christ (the Messiah). This [Man] is the true God and Life eternal.
A question was raised by a dear friend Nader, ‘Is Jesus part of God?’ I would like to use the Sun (our Sun in the solar system) to use as an illustration. Breaking the sun down we have the Sun – this ball of fire in the sky, then we have sunrays that penetrate our atmosphere and shines on the earth. When the sun shines on the earth it warms up – heat. So its 3-in-1 Sun (God the Father); Sunrays (Lord Jesus Christ); Heat (Holy Spirit), in my humble opinion. The verse in 1 John 5: 20 is an example to show to you how Jesus is part of the Trinity as explained by the Apostle John.
Colossians 2:9Amplified Bible (AMP)
9 For in Him the whole fullness of Deity (the Godhead) continues to dwell in bodily form [giving complete expression of the divine nature].
You can see the Apostle Paul see’s Jesus also as part of the Deity.
In my humble opinion, I believe that the Lord Jesus is one in God.
I hope this answers your question, may the Holy Spirit open your heart to receive this word and may you come to understand the Word of God. The Holy Bible.