One problem that some express with biblical Christianity is the concept of judgment. Those who oppose the faith have a strong dislike of the idea that God would cast into hell those who do not come to him for salvation by grace through faith in Jesus Christ. They feel that this is unfair, unkind, or simply not open-minded enough.
But a look at the word of God, in just about any place in the word of God, will show that this has indeed always been the way of God. The Lord has had a particular way that he is to be approached. The Lord has defined a particular way that his favor is granted. And those who refuse him by refusing to come to him in the way he defines are subject to his judgment.
In the Old Testament, this was true of the sacrificial system. Individuals were told by God exactly what offerings to offer in order to be forgiven. God told them also what animals could be offered that would have been unacceptable. What do you suppose would have been the right response of God to one who would slaughter a pig on the altar instead of a lamb? That person would not have found the forgiveness of god, no matter how much that person wanted the pig to be the right offering. It simply was not acceptable to the Lord.
Or how about this warning I came across in my daily reading from Hebrews 12?
Hebrews 12:25- See that you do not refuse him who is speaking. For if they did not escape when they refused him who warned them on earth, much less will we escape if we reject him who warns from heaven.
In the Old Testament, people did not escape the judgment of God when they heard his warnings given from men on earth. Nobody called this unfair. If a prophet of God gave you a warning, it was your responsibility to follow the direction of that prophet to be in the favor of God. Well, take the argument from the lesser to the greater. If we know that ignoring a warning from earth leaves us under judgment, how much worse for us must it be if we ignore the voice of God warning us from heaven?
The Holy Scriptures are the voice of God going out over the entire world. God has made it plain in the word of God that there is one and only one way to approach him. That way is broad, meaning that it is open to all people of all nations and all backgrounds. Any person, rich or poor, young or old, free or slave, man or woman, any person anywhere who will repent of their sin and come to Jesus in faith will find forgiveness.
But that way is also narrow. How? It is the only way. God is in no way obligated to make a second path to his grace. God has provided the entrance. God has provided the Savior. God has provided the only sacrifice that can cover our sins. To reject that in favor of anything else, no matter how nice it may seem is to reject the grace of the one who speaks from heaven. And there is no life to be found in that sort of rejection.