In heaven, will God know each person individually even if there are billions of people?
Yes. In eternity, even with billions of participants, each individual remains an individual whom God knows personally, and believers will know Him personally. Scripture teaches this, and it is mind-boggling yet true, so it can be believed. They will see Him face to face.
Les explains that Christ the God-man is in heaven at the Father's right hand, but we should not try to picture Him in the flesh, because God is beyond anything we can put together. When we finally get into His presence, we will see Him face to face. He says eternity is such that even though there may be billions of participants, each individual is still an individual whom God knows personally, and we will know Him personally. He acknowledges this is mind-boggling, but the Word teaches it, so he personally believes it. In that eternal state there will be no night, no need for sleep or rest, but constant activity; God gives light, and believers will reign with Him over the new planet forever and ever.