Why do all the "Christian" churches teach that all "good" people go to heaven?

I commend your thinking and research.

The churches teach that all "good" people go to heaven because they do not believe what the Bible really teaches.

"Good" is different in different cultures, so what is good in one culture may be bad in others. So one must know what the Bible teaches to know what qualifies a person for heavenly life.

First, it is God who chooses.

Humans with heavenly prospects have come to an accurate knowledge of the truth. (1 Timothy 2:3-4)

They have been baptized in water and with holy spirit and are thus spirit-begotten disciples of Jesus. (John 3:3, 5)

Another requirement is that they conform to God’s moral standards and manifest such qualities as honesty, integrity, and compassion. (1 Corinthians 6:9-11)

They must follow Jesus’ instructions as pointed out in Matthew 28:19, 20.

While on earth they put into practice what is stated at 1 Corinthians 1:10. Now I exhort YOU, brothers, through the name of our Lord Jesus Christ that YOU should all speak in agreement, and that there should not be divisions among YOU, but that YOU may be fitly united in the same mind and in the same line of thought.

They must also remain loyal to God and Christ till the end of their earthly course. (Luke 22:28-30; 2 Timothy 2:12)

Only by meeting those requirements can they show themselves worthy of being

resurrected and qualified for the weighty responsibility awaiting them in heaven, namely, serving as priests and kings with Christ over mankind for a thousand years.—Revelation 20:6.

The meek ones are those who are as faithful to God as those who are chosen to go to heaven, and they share with them in the work they are assigned. This is to help others learn about the kingdom of God and what it will do for mankind. They will live forever on the earth once it is restored to its original condition, a paradise.

Not all Christian churches teach that all good people go to heaven because that is not what the Bible says. There will be some who go to Heaven according to the Bible.

For the great majority of those who choose to do God’s will, the prize worth working for is eternal life in a new world of God’s making. (Ps. 37:11, 29) Jesus confirmed that this was a valid hope. He said: “Happy are the mild-tempered ones, since they will inherit the earth.” (Matt. 5:5) Jesus himself is the principal one to inherit our earth, as Psalm 2:8 indicates, and he will have 144,000 corulers in heaven. (Dan. 7:13, 14, 22, 27) Those sheeplike ones who actually will live on earth will “inherit” the earthly realm of the Kingdom ‘prepared for them from the founding of the world.’ (Matt. 25:34, 46)

THEY ARE THE ONES who survive Armageddon to start the rebuilding of the paradise earth:

(Proverbs 2:20-3:1)

“20 The purpose is that you may walk in the way of good people and that the paths of the righteous ones you may keep. 21 For the upright are the ones that will reside in the earth, and the blameless are the ones that will be left over in it. 22 As regards the wicked, they will be cut off from the very earth; and as for the treacherous, they will be torn away from it. ”

Those who are & will be those who side with God's kingdom., as stated:

".....thy kingdom come thy will be done on earth as it does in heaven.......Matthew 6:9

This involves the earthly resurrection as stated:

(John 5:28, 29)

“28 Do not marvel at this, because the hour is coming in which all those in the memorial tombs will hear his voice 29 and come out, those who did good things to a resurrection of life, . . .”

The feasibility of this marvel is as illustrated:

*** it-2 p. 792 Resurrection ***

Resurrection During 1,000 Years. A very liberal estimate of the number of persons that have ever lived on earth is 20 billion (20,000,000,000). Many students of the subject calculate that not nearly so many have lived. Not all of these, as it has been shown in the foregoing discussion, will receive a resurrection, but even assuming that they did, there would be no problem as to living space and food for them. The land surface of the earth at present is about 148,000,000 sq km (57,000,000 sq mi), or about 14,800,000,000 ha (36,500,000,000 acres). Even allowing half of that to be set aside for other uses, there would be more than a third of a hectare (almost 1 acre) for each person. As to earth’s potential food production, a third of a hectare will actually provide much more than enough food for one person, especially when, as God has demonstrated in the case of the nation of Israel, there is abundance of food as a result of God’s blessing.—1Ki 4:20; Eze 34:27.

*** w07 9/15 pp. 11-12 John Milton's Lost Treatise ***

Today, John Milton is best remembered for composing Paradise Lost, a poetic retelling of the Biblical account of man’s fall from perfection. (Genesis, chapter 3) It is primarily this work, first published in 1667, that earned Milton literary fame, especially in the English-speaking world. He later published a sequel entitled Paradise Regained.

--These poems present God’s original purpose for man—to enjoy perfect life in an earthly paradise—and point to God’s restoration of Paradise on earth through Christ. In Paradise Lost, for example, Michael the archangel foretells the time when Christ will “reward His faithful, and receive them into bliss, whether in heaven or earth, for then the earth shall all be paradise, far happier place than this of Eden, and far happier days.”

God defines good in the first chapter of Genesis as 'of God'. So those who are 'of God' are going to heaven.

Dead, in that verse, means the person has died to themselves, been buried in a watery grave of baptism and resurrected to live only in Christ. They (the dead ones) are freed from sin.

Because if there is a God who would send good people to eternal torment for being wrong about him, then he would be a monster not worthy of worship.

I could burn a church full of children. All i have to do is repent and accept jesus and i get into heaven. Dont forget God murdered also.

you changed the word, it was freed, now you said cleared.

freed means "away from this sinful world, away from the traps of sin"

"men our saved by mercy and grace alone, not by works, so that no one can boast."