Based on the idea that different religious groups that have responded differently to Jesus and their differences have been blamed for much injustice and hatred over the centuries.
Christendom has also contributed to hatred and bloodshed. In fact, I'd go so far as to say that any religion that advocates bloodshed to support the political agenda of its nation, cannot be supported by anything Christ taught. He advocated that we 'love our enemies and pray for those who persecute us'. He also said that true Christians (as opposed to the counterfeit weeds sown by the devil) would never raise a hand against their brothers. To do so made them unacceptable to God. (1 John 4:20, 21) Yet in the two world wars fought by all nations, (I believe only one nation remained neutral) Catholic killed Catholic and Protestant killed Protestant under the guidance of their spiritual shepherds (chaplains in the armed forces) who even blessed the weapons that would be used to kill their fellow believers and even innocent women and children. Does this sound like true Christianity to you?
Nationalism becomes a 'religion' when it is placed on equal footing in the hearts of people who put the love of their homeland before obedience to the Christ. Its a difficult test when one is raised to believe that one's own country is somehow blessed by God.....God no longer supports any particular nation. (Acts10:34, 35) That means you can't be a spiller of blood and yet still be a Christian. You can be one or the other, but not both.
In some countries even today the differences in response to Jesus are being used as an excuse for hatred, discrimination and division.
Yes indeed, so the question is why?
The Abrahamic religions are too busy being "right" in their own eyes to be "right" in God's. This was Jesus' main bone of contention with the religious leaders of his day.
The apostle Paul wrote:
"Return evil for evil to no one. Take into consideration what is fine from the viewpoint of all men. If possible, as far as it depends on you, be peaceable with all men. Do not avenge yourselves, beloved, but yield place to the wrath; for it is written: Vengeance is mine; I will repay, says Jehovah. But if your enemy is hungry, feed him; if he is thirsty, give him something to drink; for by doing this you will heap fiery coals on his head. Do not let yourself be conquered by the evil, but keep conquering the evil with the good." (Rom 12:17-21)
The genuine Christians are the ones who are "peaceable with all men", including their enemies. These are the ones who allow 'vengeance to belong to God' who told us that he will "repay". We do not need to fight, but to 'keep conquering the evil with the good'.
Christianity is evident by actions, (or sometimes lack of them) not just empty words.
Wouldn't it be strange if God sees all the 'Abrahamic' religions as counterfeit imitation religions? "By their fruits" Jesus said you would recognise his disciples. So we don't look at what people say because talk is cheap. Their actions speak so much louder than their words.
Just like in the first century, Christ's followers are very different to the mainstream.
It takes courage to be different to the majority, and it takes a genuine love for God to see through empty religious falsehood that contributes nothing but more trouble in a world that Jesus told us to be "no part" of. (John 15:19, 20)