We do not only need to believe in the Son of God, we must also believe in the One who sent Him, i.e. God the Father.
We cannot please God if we do not believe He exists or rewards those who seek Him. He referring to all three Persons.
Can we be saved if we do NOT believe in the Trinity, One God in three Persons? Of course not. We must believe in God the Father, God the Son and God the Holy Spirit.
To believe in only one of the three would be like saying I believe in one third of God, or I believe in two thirds of God, but I do NOT believe in the Triune God.
You shall not listen to the words of that prophet or dreamer of dreams; for the LORD your God is testing you to find out whether you love the LORD [Yahweh] your God with all your heart and with all your soul. That would be the God presented in scripture, NOT the god of human conjecture.
Now Jesus cried out and said, “The one who believes in Me, does not believe only in Me, but also in Him who sent Me.
Now without faith it is impossible to please Him, for the one who approaches God [in Three Persons] must believe that he exists and that He rewards those who seek Him.
Some folks believe God the Father created the Son, rather than God the Son is our Eternal God. That is false.
Some folks believe the Holy Spirit is a force and power, but NOT a person, with will, emotion and intellect. That is false.
Were all three Persons involved in the creation of everything? Yes
Were all three Persons involved in the creation of the 'New Creation" those born anew as children of God? Yes
