First, as far as God and the rest of the world, he left that as our task:
Mark 16:15-16 (King James Version)
15And he said unto them, Go ye into all the world, and preach the gospel to every creature.
16He that believeth and is baptized shall be saved; but he that believeth not shall be damned.
As far as why there has been nothing "new" to date, two things, one, God works in his own time, not yours or mine and he is working among us now, though not through false prophets or those who seek to change his nature or his word, nor change the path of salvation or add to it, that is work left to the evil one, who has much success in that endeavor.
Also there is this: John 19:28-31 (King James Version)
28After this, Jesus knowing that all things were now accomplished, that the scripture might be fulfilled, saith, I thirst.
29Now there was set a vessel full of vinegar: and they filled a spunge with vinegar, and put it upon hyssop, and put it to his mouth.
30When Jesus therefore had received the vinegar, he said, It is finished: and he bowed his head, and gave up the ghost
Jesus was finished, the scriptures fulfilled, all that remain were stories to build on what he taught and the examples of his apostles to set in motion the formation of his church.
When the time comes God and Christ will reveal themselves again as promised, and the book shall be reopened, the legacy and historic linage carried foreword as it always has been, in very linear and uniform fashion, with no harsh turns to the improbable...
Oh, and as far as "Not adding or taking away from the Bible" no being discussed, again, nice try but I suggest a few verses for you, and read then from a proper bible, not one corrected by your fellows:
Deuteronomy 4:2
Deuteronomy 12:32
Proverbs 30:5-6
Revelation 22:18-19
Galatians 1:6-12