Could you please elaborate on the above?
God has revealed Himself to all mankind through general revelation; which is described in Romans 1:18-20.
18 The wrath of God is being revealed from heaven against all the godlessness and wickedness of men who suppress the truth by their wickedness,
19 since what may be known about God is plain to them, because God has made it plain to them.
20 For since the creation of the world God's invisible qualities—his eternal power and divine nature—have been clearly seen, being understood from what has been made, so that men are without excuse.
These three seemingly simple verses describe several things about general revelation. First, God is the giver of general revelation. Second, He gives it to all men, no one is excluded from this knowledge. Third, Gods main attributes, namely, his power and divine nature are what He reveals to everyone. Forth, these attributes of God are understood by looking at creation. Finally, this knowledge of God is presented in such a way that men are without excuse for not believing it.
There will not be anyone who can claim that they didnt understand that God exists by looking at creation. He presents this information about Himself in a way that reders mankind excuseless. The other poster that claimed some people cannot believe in God because they are not spiritual will not stand up in Gods court.
Special revelation is what is refered to in Luke 16 passage concerning Moses and the Prophets. God has chosen to reveal much more information in the Old Testament (as well as the New) about Himself. The Rich man and Lazarus passage could be a parable ... but the dialog between the rich man and Abraham suggests that it is more likely the actual accounts of the lives mentioned.
Notice a few things about the story. Jesus calls the rich man ... "a rich man" ... but he calls Lazarus by name. Second, after the rich man died, he went to a place of torment ... he felt the anguish, he felt thirst ... and most importantly, his immediate concern was for his brothers whom he knew did not believe. The rich man then makes a few requests which cannot be fulfilled. The second is to send Lazarus back to warn his brothers.
Abrahams response is that Moses and the Prophets contain all they need to know to avoid going where the rich man went. The man insists that his brothers wont believe unless Lazarus returns from the dead to warn them.
Abraham then delivers the punch line. If they will not listen (hear, heed) to Moses and the Prophets, neither will they listen (hear, heed) if someone rises from the dead.
Jesus point ... I believe is clear. Men choose not to believe in the revelation that they have been given, nor do they seek after the additional revelation that is available to them. There are other places in the Bible that mention that people do not believe because their minds are blinded, they love their sin, and are basically self-serving in the extreme.
Hope this helps.