Since we live in the endtimes we should expect the best understanding of the Bible the closer we get to the very end - Daniel 12.4,9 .
God Yahweh is the only true God as Jesus said in John 17.3 . God of Jesus and Israel fills up the whole universe which means literally He is present everywhere always .Every particle of the universe is being sustained by that Wonderful God . Every snowflake ,raindrop He creates and guids to the earth ! How many of them in just one spot when we look ! This is God I am serving !
So God penetrates all places ,all bodies be it believers or atheists and yet we read in the Bible God lives in those who worship Him in truth.
That must be an arrangement most people don't understand . God made many arrangements we must look for in His Word the Bible.The words like God used in the Bible must be read in the proper light of the Bible .
Once you properly understand the Bible you will know that Yahweh is GOD but Jesus is God and these two are different and thanks to English language I could express that difference by making distinction in writing these two words.
If Jehovah's Witnesses are true christian religion there must be God present there and Jesus Christ as some verses from the Bible could be used to prove that . John 14.23 is a beautiful example God and Jesus abide in true christians . And we must simply identify who are those true christians . If a religion is not accepted by God then we can say God Yahweh and Jesus are not present there .
Jesus is not GOD but God and it has spiritual meaning just as Jesus is adopted son of God - the first one of the New Testament so can be called the Son as the sign of distinction. And God Yahweh can do all things for him what Jesus asks so Jesus can know what he wants to know .This way he can know all things but not all at once as he is a human being perfected once for all the time .