In a modern light, those quotes do look very bad, but the truth is, that the historical context in which these things were said should definetly be taken into consideration. Everything that you've listed merely reflects the problems associated with that particular time period; an example is the wars between muslim, christians and jews that were a huge factor in their attitude towards each other. They were considered enemies for this reason and trusting eachother and befriending eachother was difficult. Today, i, and countless other muslims, have many christians friends that we very close to, because its not an issue for us in modern times, in the country we live in.