Saving Water and Holy Ghost Baptism?

John 3:5: Except a man be born of water and of the Spirit, he cannot enter into the kingdom of God.

Real salvation is to 'Enter The Kingdom of God'?
John3:5=Acts2:38=Heb6:1-2=Titus:3:3-7

As practised in:
Acts 8:12-17, 10:44-48, 19:1-6

Asking,
Fritjof