The Bible teaches that we are like those who have been bitten by snakes. Moses did not place a serpent of brass on a pole in order that people might be bitten, they had already been bitten and the purpose of the brass snake was in order that they might survive their bites.
Christians believe that this even foreshadows the crucifixion of Jesus. Jesus did not come into the world to condemn people, they were already condemned both by the ways in which they had caused harm to their neighbor and by failing to hearken and submit to their inventor's instructions. (Humans are God's handiwork. He is our inventor and our creator.)
God had no intention of letting Abram actually kill Isaac. You are evaluating that event based on the external aspects of the event without understanding why God told Abraham to take Isaac to Mt. Moriah and sacrifice him. To your mind, this is like those religions which actually do kill their children. But God had a purpose for this command and it was not the killing of Isaac.
God did not send people forth to evangelize those who were in a safe condition prior to evangelism. If you will recall, Israelite men were supposed to go to Jerusalem every year under the law. The events at the beginning of the gospel age occurred on days which God had set up about a millenium and a half previously.
Leviticus 23:5-8 describes the week and day on which Jesus was crucified. In english, this is called "Passover" but that is not the Hebrew word.
Leviticus 23:11 describes the day that Jesus was resurrected. "The day after the Sabbath" during the week of unleavened bread. This is also called the day of firstfruits because of what is written in verse 10.
Leviticus 23:15-21 describes the day on which the events in Acts 2 occurred.
The Israelite men were supposed to come to Jerusalem for the days described in these passages. That is the reason there were people from all over the map present on the day described in Acts 2. They were there for the feast of weeks which God had ordained in the days of Moses.
Those present are described thus:
Parthians and Medes and Elamites, those dwelling in Mesopotamia, Judea and Cappadocia, Pontus and Asia, Phrygia and Pamphylia, Egypt and the parts of Libya adjoining Cyrene, visitors from Rome, both Jews and proselytes, Cretans and Arabs
Those who were zealous Israelites were in the city on the day that the Gospel was first preached. But God also set things up so that the Gospel spread like wildfire.
In addition to this, the Bible tells us of at least three people whose hearts God evaluated and He made special arrangements for them.
There was a eunuch who was prohibited from entering the assembly of the male Israelites due to the command found in Deuteronomy 23:1. Yet in spite of this, he had traveled all the way to Jerusalem from Africa to stand in the courtyard provided for those who were not Israelites (although he may have been an Israelite yet because of the above law he had to stand in a separate place) because he desired to worship God. But not only this, on his way home to Ethiopia, he was reading from the prophecy of Isaiah at a time when there were no chapter breaks or verses and was trying to understand what the prophecy meant. God sent an angel to a preacher named Philip (not the apostle) and told him where he could intercept the chariot as it was traveling.
There was a man who was fervently pursuing and arresting Christians because he thought hat this is what God would want him to do. God understood the heart of Saul and Jesus appeared to him and told him to go into Damascus and God sent a preacher named Ananias to tell Saul what he needed to know in order to receive salvation.
There was a Roman army officer who believed in the God of the Israelites and who gave benevolent gifts to needy Israelites and also prayed to the God of the Israelites. God sent an angel to him and told him to send to Joppa for a man named Peter who would tell him what he need to know to receive salvation.
(From Acts 2 onward, none of the heavenly visitors told the lost person what theyneeded to know. In each of these examples, a physical human taught the lost person the message of God.)
The Bible also indicates that all the believers in the first century went around telling others. The idea of a "clergy-laity" distinction is an apostate idea which is not found in the Bible.
Slamdunk406 told you about his religion's views regarding those who have not heard the message. But in that viewpoint, those who have never heard the message are btter off not hearing the message until the next life when they will not need to believe in life after death because they will already be alive after death.
"Faith is the assurance of things hoped for, the conviction of things not seen." and in another place "For in hope were we saved: but hope that is seen is not hope: for who hopes for that which he sees But if we hope for that we see not, then do we with patience wait for it."
In my viewpoint, the purpose of evangelism is analogous to why medical volunteers go to places where an epidemic has broken out. They don't go to make people need medicine, they go because the people are dying and already need the medicine.