Well, Higgs, I disagree on many of your points.
1. (Scientific knowledge and religion have nothing to do with each other at all.) You might argue that all knowledge is "subjective" because we use our senses to gain it, but each of my senses and senses of all the people around me corroborate that knowledge so it is quite reliable. You seem to be using the term "subjective" to find an excuse to equalize something we observe everyday with things we never do. If I fall from a 10 story building, I will most likely die. That's as close to objective, as you can get. Things like life after death and washing away sins after believing in Jesus have not been observed. Not by reliable sources anyway.
And by hampering science, just take a look at evolution denialists for example, that stems from creationism and creationism stems from theistic religion.
2. I don't see how things offensive to common sense can be an advantage. If you don't like that word, I can change it to individual morality: what ever I do has consequences on others and I take those into account. TO say that christianity and islam question the liberal views is totally backwards. It is not liberal views that have slavery condoned into their sacred texts, liberals don't kill gays, liberals don't protect their rapist coleagues in churches. If you had something else that qualifies as a radically different view of truth, by all means say it. Though, whatever you might have, can't be exclusive to religion. I'm not saying that all religious people do afwul things, but if they don't, they don't because they have their own morality and sense of good.
3. Love and charity are something people are capable of with or without religion.
"Whatever is good in Christianity belongs properly to Christianity". Please, do name something that is good and is good exclusively in christianity.