There are so many people who think that God has changed, or that the Old Testament talks about a different God than the New Testament. They couldn't be more wrong. God has always been about being in relationship with us, and has always given the same guideline - believe in Him and walk with Him.
Now, people interpret these things differently sometimes, but I don't think there are that many different ways to look at it. God has always been gracious - even Deuteronomy tells us that He loves to reach out to the alien. Isaiah talks about the Gentiles being included in the plan all along. And the New Testament is all about finishing the work He started, giving us a mediator who knows what it is to BE us, and who succeeded where we failed. Hebrews says that God, therefore, can deal gently with us.
We have ever been meant to walk in His steps, to be like Him. And the promise of life has ever been the same.