I cannot relate to your question in terms of the morals behind 'why religion turns people against the world because that would also be turning against Jesus', since I'm atheist, but I could offer you some reasons why religion turns people against other individuals, groups, countries or societies:
1. Religion is OLD and was championed in an era when tribalism and archaic heirarchies and clannish loyalties reigned supreme. Therefore religion is by definition of the age it was fermented in perfectly suited to the selfish, the cockily certain and to groups that like to divide themselves and justify the often violent (today maybe more verbally confontational) divisions with a divine warrant.
2. It promotes fear through seemingly benign threats and the necessity for belittling ones self. This promotes an element of selfishness in people in an effort to 'save ones own skin' when they are to be judged and will often lead to widespread hatred of clerically approved groups or individuals as though it solidifies their piousness and subsequent entry into the kingdom of god.
As a foot note, i'd like to highlight that devoting ones life or living according to the teachings of Christ is a bit of an ironic disposition. Jesus forgave the sins of all those who had trespassed against others without a second thought for the greivances those trespasses had caused the victims. One of the core principles of Jesus' 'morals' is that you, as a Christian, have every right to discard your responsibilites on to an imaginary friend and let a bloody scapegoat die for your errors. This is arguably a relinquishment of a core tenant of morality itself: being accountable for your actions, having responsiblity. I therefore struggle to understand how so many Christians can justify following their faith in the name of goodness at all.
If I were you, I'd discard the man-made precepts of religion and just follow your gut feelings, your heart, your innate human capacity for understanding and morality when deciding how to act or feel about such things as abortion.