You simply have no clue what you're talking about.
What does Acts 10 say about Cornelius?
1. A devout man who feared God
2. Gave alms generously to the people
3. Prayed continually to God.
What is more, when Cornelius is visited by an angel in a vision, what does the angel say? "Your prayers and your alms
http://www.esvbible.org/Rv8.4;Ps141.2;Dn10.12/have ascended
http://www.esvbible.org/Mt26.13;Mk14.9;Ac10.31;Hb6.10/as a memorial before God..." In other words God heard Cornelius' prayers.
While Cornelius was not yet a believer in Christ, he did believe in and fear Yahweh, the God of the Bible. There simply is NO way around what Luke is meaning to convey here--that Cornelius already knew the One, True, and Living God and worshiped Him. We see God's grace in that God sent the angel (and then Peter) to bring Christ to his waiting heart.
The Archangel
On the Day of Pentecost "there were dwelling at Jerusalem Jews,
devout men, out of every nation under heaven." (2:5)
...
the multitude came together, and were confounded,...they were all amazed and marvelled, saying one to another, Behold, are not all these which speak Galilaeans? And how hear we
every man in our own tongue, wherein we were born? (2:6-8)
--There were about 100,000 devout Jews assembled together in Jerusalem.
They were all witnesses to the phenomena recorded in Acts 2:1-4, and all were amazed.
However, out of approximately 100,000 only 3,000 were regenerated and saved. Devout as they were the others were not.
Some mocked and claimed that the disciples were drunk.
Among them were the Sanhedrin, and also the very ones that put Christ to death. The record calls them "devout Jews." It has nothing to do with regeneration.
As in Acts 10, so here. Cornelius had never heard the gospel, never heard of Christ (except possibly in a derogatory manner), never heard any NT revelation, and could only grasp some OT revelation that he could hear from afar, not being "a full proselyte."
To assume that a pagan Roman centurion that had heard some OT revelation and had no NT revelation, and had never heard the gospel even once, is regenerated, is preposterous. It makes about as much sense as going to a Muslim nation and reading a portion of the OT to each Muslim and then proclaiming them saved. Remember both groups: (Muslims and Jews) are anti-Christian. The Jews were in the first century when the persecuted Christians as Saul did and when they crucified Christ, and Muslim persecute Christians today.
Easy work for a missionary isn't it? Go read a bit of the OT to a Muslim and presto, he is regenerated!! That is what you are telling me. That is the comparison. There are many "devout Muslims."
God appeared to a heathen king in a dream but that did not mean that the heathen king was saved.
Gen 20:3 But God came to Abimelech in a dream by night, and said to him, Behold, thou art but a dead man, for the woman which thou hast taken; for she is a man's wife.
The man was simply religious, not saved.
It is probable that "Mother Theresa" of India was more devout and full of good works than Cornelius was, but yet was not saved in her life time.
Being religious does not save a person. Why would you stick to such a position?