I would think the opposite. Christianity has shaped the Western world so thoroughly that even those who do not openly adhere to it still follow it. Jesus was a poor criminal executed in worst way. Yet, he became God. Concern for the meek and disadvantaged is a Western ideal because it is a Christian one. Historically, appeals for human rights have been based on it. Wilberforce was an evangelical Christian. I may be an atheist, but the notion that Christianity is the problem seems quite wrong.
I couldn't disagree more.
The idea that western liberalism, with its concern for the disadvantaged, is a result of Christianity is a widely accepted bit of propaganda, but it doesn't withstand scrutiny. It's a case of noting a correlation, and assuming a causal link - but if anything, the cause and effect are the reverse of what Christians would like us to believe.
In European history since the dominance of Christianity in the late Roman period, the only way to advance any political ideal was to claim support for it from Christianity. Wilberforce was highly successful in changing the world, in part because he was able to persuade many people that his preferred way was the Christian way. But his opponents were also devout Christians, and were equally convinced that Christianity supported their preference for owning slaves.
In order to persue any agenda in a society dominated by religion, you must claim the support of that religion. And fortunately, the Bible is a Forer Effect document - it's fairly easy to find biblical support for whatever position you want to take.
Henry VIII was convinced that he should be all powerful, and able to tell the pope what to do. The pope disagreed, so Henry started his own version of Christianity, with blackjack and hookers.
That same new version of Christianity was employed two hundred years later to justify stripping the king of England of his power, and chopping off his head. And then a decade or so later, to justify restoring the monarchy.
All developed nations today, with the very notable exception of the USA, are post-Christian, not Christian. Christianity used to be a prerequisite for wielding authority, but now it's not - except in the USA.
And the nations with the most caring laws in support of the poor and meek today tend to be the most secular ones. Christianity didn't shape the Western world; the Western world shaped, and then abandoned, Christianity. It has been abandoned largely because it no longer serves its sole purpose - the control of public opinion. In Europe, a politician who says that you should vote for him because Jesus would want you to, will find that he loses support as a result of that declaration. That's a very new phenomenon, and until recently, such a declaration was not only effective, but practically unavoidable, if you wanted to sway public opinion in your direction. The USA still hasn't caught up.
Christianity wasn't liberal, peaceful, or supportive of the poor and meek (except as a recruiting gambit) when it started, nor for most of its history. It has become those things, because western society has driven it in that direction. To suggest that western liberalism is caused by Christian liberalism is to put the cart before the horse.