**Is it because if we know ( rather then merely believe). that God exists, we cannot be good. **Because all our actions instead of being altruistic would be done out of a desire for reward and a fear of punishment?
This question caught my attention and reminded me of a comment by Jesus about his own credibility based upon his own certain knowledge that God attests to him. To ask your question in this context, it would be something like: ”
If Jesus knew (rather than merely believed) that God exists then could he not be truthful?”
If I testify about myself, my testimony is not valid. There is another who testifies in my favor, and I know that his testimony about me is valid. (John 5:31-32)
What is interesting here is how your underlying belief about justification when speaking about action seems to relate to but actually conflicts with Jesus’ thoughts about verification when he speaks about truth.
It appears that justification is the issue for you in your question. You suggest, or perhaps merely question the idea, that if we knew God existed, as a matter of fact, then all our actions would be done because of fear or desire and could not be “altruistic.” However, one could ask, in reply to you: “Why could actions not be done simply out of love for who or what God is?”
I find it rather paradoxical, at least on the surface, that acting for the sake of another could not be altruistic precisely because the idea of altruism is founded on doing things for the sake of other rather than merely from our own desires. It would seem that doing an action to please God would fit quite well into the notion of altruism.
Where your point collapses is assuming that where God is concerned, humans
can only act out of fear or for reward and not simply out of a desire to please God without other, less than worthy, attendant motives.
The problem, it seems to me, comes up when you surreptitiously add the idea of justification into your analysis. If our actions are done in order to be justified in God’s eyes (desire for reward or fear of punishment) and not simply to please God, that seems to presume that no option for acting justly before God is possible. This difficulty may arise because of a presumption that the rightness or wrongness of our actions can never fix a fallen nature and therefore we can only act from a being and motives that are essentially fallen or broken.
Part of the confusion may also be between doing things in order, simply, to 1) please God or in order to 2) be pleasing to God. The first relates to an action, the second to the being or will of the agent carrying out the action.
It is clear from Scripture that God is not “pleased” by actions that do not originate from a being that has not been made “right.” A liar is not truthful simply because they happen to say things that are true some of the times, in particular, when they are saying truthful things merely to appear “truthful” to others. Just as God would not be fooled by a liar telling the truth sometimes, he would not be pleased by an
unjust individual doing just things some times, but not seeing the need to actually become a fully
just being.
How the quote of Jesus from John applies here is that we do not “justify,” or make ourselves
just merely by doing
just things (a leopard can not change his spots) in the same way that Jesus saying truthful things and claiming himself to be truthful does not necessarily make him trustworthy. It is God, as the authentic source of all being, that makes things what they are, in truth. It is God alone that makes us just and truthful, capable of acting rightly and speaking truthfully. Jesus was claiming authenticity because of God bearing witness to him.
We cannot fool God into thinking we are right and just by our actions, we must be made right and just by God order to be capable of doing right and just things. Our works do not justify or make us right before God. We must be made right and just by God in order to be capable of doing right and just actions.
This fits very nicely into Catholic teaching about sanctification by grace, of being made right and just by the grace of God and not by our own efforts or works. Where the idea of salvation by faith alone and without the need for works of any kind is lacking is that it seems to exclude the need for an individual’s being and will to be changed or “made right” at all.