I don't agree with your beliefs, but then I think it is pretentious and, actually, quite silly to spend time trying to determine who God will welcome to heaven. You don't know and you won't know if and until you get there yourself. God sent his Son to teach us how we are to live so that we can be united with Him in heaven, not to teach how how to judge whether someone else will or will not enter the Kingdom of God. I know what God has revealed to me and what He expects of me and that is all that's important. What God has revealed to and expects from others is known only to God and is something that is not necessary for me to know.
BTW, most American Christians, even Evangelicals, believe that those of other religious faiths can go to heaven.
A Beliefnet/Newsweek poll conducted in 2005-AUG asked 1,004 randomly selected American adults about their religious beliefs. 7 One of the questions was: "Can a good person who isn't of your religious faith go to heaven or attain salvation, or not?" Results were:Group Yes, they can attain heaven No, they cannot attain heaven
Evangelical Protestants: 68% 22%
Other Protestants 83% 10%
Roman Catholics 91% 3%
Non-Christians 73% 3%
American population 79% 12%
The margin of error of the Beliefnet/Newsweek poll is ±3 percentage points.
Any Scripture?
So why would God come in the flesh, allow Himself to be beaten and grieved in every way humanly imaginable, while remaining faithful to the Father, if it wasn’t necessary for Him to provide that perfect Sacrifice?
With the perspective of good vs evil, I encourage you to discern between human good and Divine good. Human good, independent of Him might last days, weeks, years, maybe even a couple of centuries, but Divine good has eternal merit. Human good is parlayed into evil by the Adversary in an attempt to counterfeit God’s Plan and the Adversary to promote his false system while attempting to make himself as God.
There is a difference in trying to determine who is a believer and who isn’t from understanding what is meant by the Gospel.
There is a wedding feast awaiting those who persevere through faith in Christ, and a bema seat where crowns will be given as rewards for our victories through faith in Him. Meanwhile, others will endure a Great White Throne Judgment which will open the books. If a person’s name is there in those books, then by God’s predetermination they are saved, but if not a second set of books will be reviewed. If the good works as judged by Divine Standards, Not human standards, are shown to manifest a persons righteousness, then God is free in His immutable nature to give that person eternal life.
The reason why human good works independent of faith through Christ will not persevere is the same reason the Adversary shall not prevail in the future for all eternity. I tmight be better expressed, that if one values Heaven, then we better hope human good works independent of faith in Christ will not be rewarded, becasue if they are acknowledged, then God also must allow evil for all eternity future and the death of His Son was for nothingness.
So it really boils down to which God you seek to serve. Do we serve the God through faith in Christ as being trustworthy, or do we chose an Adversarial accuser who is known as the father of lies, murder and deception?
But faith isn’t rationalism. All faith comes from God and faith through Christ provides eternal salvation.