Do all the muslims and buddhists and tribesmen etc go to hell?

Yes they will. There is only one way to god the heavenly father and thats thru his son jesus Christ. U must accept the sacrifice of Jesus.life on the cross. Dont listen to the delusional people they are deceived by satan

I think you need to break out of the legalistic mindset of Western Christianity.

In Eastern Orthodoxy Heaven and Hell are not understood as literal places; nor are they understood as "verdicts" that God delivers to you like a Divine sentence. Rather, Heaven and Hell are understood as ontological states of being describing the soul's relation to God's love after the Resurrection of the Dead which we believe will take place at the end of the world.

Simply put, those who obey God in this life and allow Him to heal them via the Sacramental life of the Church will experience joy in the presence of His love--this is Heaven. But those who didn't will experience misery and pain--this is Hell. They are not verdicts that God "sentences" you to, but are real, ontological states of being.

We believe that the life and Church established by Christ is the only path to Salvation--which we understand as a healing process--and in regards to people who don't visibly belong to the Church, we don't make any judgments on them but trust and hope that God works with them in His own way, however, we can never adopt a universalist view.

According to the Bible and the Christian religion, yes indeed, they all go to Hell to burn in an "unquenchable fire" (Jesus' own words) for all eternity for their thought crimes. Those who say otherwise are ignoring a number of Bible passages, as well as 2000 years of Christian teaching and tradition.

Many Christian nowadays realize just how morally repugnant that is--it offends our modern western secular morality (much superior to the morality of goat herding tribesmen from thousands of years ago). So they are trying to spin it, or just make up new doctrines that ignore the Bible and the precedent of tradition.

If one is willing to go down the path of believing that there is a Hell reserved for unbelievers--once you go down that basic path of believing that premise--you should expect damnation simply as a matter of probability, since there have been so many gods and so many religions, all threatening damnation as the price for unbelief.

If they don't accept Jesus IS God.

Yes but they have to accept Jesus has their Lord and Savior and they have to come to the True church of Jesus Christ.

No. God judges our hearts. Those who try to do what is righteous and pure will have eternal life no matter their religion.

The angel Gabriel told me; ALL the Churches are guilty of abominations!

According to many Protestant sects, yes. According to the original and true Christian Church, to which Jesus Christ promised the fullness of truth and full authority, not necessarily.

All who try to do the right thing will not be punished.