Yes, just like the crusades, oh and the inquisition, oh and the Nazis. People have committed atrocities while claiming to be Christian too. No human group is exempt from evil and the same criticism you're giving can be thrown right back at us.
"When he has brought out all his own, he goes before them, and the sheep follow him, for they know his voice." -John 10:4
"And I have other sheep that are not of this fold. I must bring them also, and they will listen to my voice. So there will be one flock, one shepherd." -John 10:16
I take this together with my favourite parable, the parable of the workers in the vineyard. The reason it's my favourite is because it's an example of Jesus turning everything you might think on its head.
"Take what belongs to you and go. I choose to give to this last worker as I give to you.15 Am I not allowed to do what I choose with what belongs to me? Or do you begrudge my generosity?’16 So the last will be first, and the first last.” -Matthew 20:14-16
The key principle is that not everyone gets what they deserve. None of us do. I don't make distinctions based on culture or geography. We are all human and we are all one in Christ. We are also all sinners equally. I have lived among Muslims i the Middle East. My father works with Hindus and Buddhists. There are many good, moral, ethical people among them. Most importantly though, anyone can be led by the Holy Spirit, and if you see the fruit of someone's life, you can tell if the Holy Spirit is at work on them. Remember from back in John 10. The sheep know his voice and they follow him. They do not need to be of the same culture or same system of beliefs in order to be under grace and in order for the Holy Spirit to work through them. We are all one under God and Christ. This doesn't diminish the message of the cross. The grace is available to those people too, and it is manifest through the work of the Holy Spirit.
God is gracious and merciful, and one day all of his sheep will be together as one.