Yes I did in response to your words, "If you Christians ever really DO something good, if it's in the expectation of some reward in "the life to come"/Heaven, it is meaningless to God."<quoted text>
YOU made this claim:
"nobody has any tangible knowledge of God"
So YOU have to back it up.
Ball STAYS in YOUR court until you do.
Them's the rules.
You would have to know the mind of God to have such knowledge. Are you claiming to know the mind of God? How so?