Correct!

And after being baptized*, Jesus went up immediately from the water; and behold, the heavens were opened, and he saw the Spirit of God descending as a dove, and coming upon Him, and behold, a voice out of the heavens, saying, "This is My beloved Son, in whom I am well-pleased." Matthew 3:16-17 (NAS) 

* baptized - from the Greek word "baptizo", meaning to immerse or dip...to submerge.

The Father, Son and Holy Spirit are One God?

It may be hard to understand how the one God of the Bible can show Himself in three different ways at the same time (the Father, the Son and the Holy Spirit).

Let's look at an example that may help us understand this:

Water, Ice and Fog are all H₂O?

Several thousand years ago, it might have been hard for some to understand that Water, Ice and Fog are all the same element...H₂O (note:  H₂O is a chemical symbol representing 2 parts of Hydrogen and 1 part of Oxygen).
 

H₂0 appears in different forms...a concept that many did not understand until scientific discovery in the last several hundred years.

Further Study:

Although not a perfect example, we may never understand fully how the Father, Son and Holy Spirit are a part of One Deity or Godhead, but we can affirm from the scriptures that there is only one God.  For further study see Isaiah 45:21, John 1:1-2, Malachi 2:10, and I Corinthians 8:6, and also Lesson 3 - The One True God.

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