Really? So Judaism , Christianity and Islam are all about what exactly? I spent an inordinate amount of time in the Christian faith and I can speak with certainty that the core of the faith is that 1) there is something terribly wrong with human beings (being born with a sin nature because of Adam and Eve), 2) that man and God are separated because of this sin business (which is part and parcel to the Adam myth) and 3) No one gets to God except through accepting the human sacrifice of the virgin (with regards to sin) Jesus. Jesus is the "mediator" between God and man. Anyone who wants to say that the sacrifice (either in the OT or NT) is meaningless is not very well informed. Indeed, the comparison between the first Adam and Jesus ("the second Adam") is pivotal to understanding the Christian faith.
That was the denomination that you were a part of, and is indeed common among many of them.
My point is that true forgiveness does not require a mediator or a sacrifice.
Christianity is not about all that stuff in Matthew 5. If it was, the Bahai faith would serve just as well. But Christians claim that anyone who is not a Christian is going to Hell by default because only by accepting the bloody sacrifice can anyone be right with God.
SOME Christians say that. I know many Christians who accept that others believe differently and have even said that other paths to God are valid.
If your statement above was actually true, there would be no cause for religious wars. But no religion is as you want to portray it. They are all myopic and exclusive and full of blood thirst.
ALL of them? That's odd... I've never heard of Buddhists waging wars. Or Taoists, for that matter.
You see, you're forgetting one very important detail: PEOPLE DISAGREE!! Some people are able to just agree to disagree and go on with life, others feel they have to defend their position until they turn blue. When such people get into power, wars are fought.
OH! And I almost forgot something.
"Whatever path men travel is my path; no matter where they walk, it leads to Me." (Bhagavad-Gita, Chapter IV) There's your Sanatana-Dharma exclusiveness for you.