First, the Vedas do not change. The Vedas are the eternal truths about God. They are the revealed word of God and are not subject to change.
In Hinduism you have to be more exact when talking about God. The English word God has different connotations in Hinduism which are very different from those in the West. In the West, the term usually refers to a dualistic personal Godhead who sits on a throne in heaven and is the creator. In Hinduism, there are different concepts of the Godhead, some personal, some impersonal.
Most Hindus do agree on four major points, however. First, they all believe in God. Second, they all believe that the Vedas are the eternal revealed words of God. Third, they all believe in cycles - the universe does not just happen once, there were unnumbered universes before this one and there will be unnumbered ones after this one. Fourth, they believe in the reincarnation of the soul until it finally achieves either union with Brahman or the eternal presence of the soul with the Godhead.
The Rig Veda says that "Truth is One, men call it by various names" - there is no 'one' path for everyone. As a mother will prepare different food to suit the stomachs of her different children, so the Lord has prepared different paths for people to follow. One should look into the different ways to approach God and decide which one suits your taste the best. Find a teacher. Once you decide, follow it with all your heart. For every step you take towards God, God will take 10 steps toward you.