Ok. The thing is, I was baptized Roman Catholic. The information on the Internet is kind of confusing on the views of sex, abortion and stuff. Is there any difference on those topics from Christianity to Catholicism?
There are difference between what the Roman Catholic church teaches and what you find in the Bible. In regards to abortion, the Roman Catholic church correctly declares that it is wrong. From the biblical viewpoint life begins at conception -- when the sperm joins with the egg. Throughout the Bible, a child in the womb is still referred to as a child. See Genesis 25:21-22; Job 3:3,16; Hosea 12:3; Luke 1:36,41,44 as examples. To take another person's life is murder and one especially heinous form of murder is when an innocent life if take. One crime that God particularly hates is "hands that shed innocent blood" (Proverbs 6:16-18).
There is also agreement between Roman Catholicism and the Bible concerning when sex should take place. Sex belongs only between a married couple. "Marriage is honorable among all, and the bed undefiled; but fornicators and adulterers God will judge" (Hebrews 13:4).
In the Roman Catholic view, sex exists for the purpose of having children. Therefore, they conclude that it is a sin to interfere with the possibility of conceiving a child during sex. They teach against using birth control pills, condoms, and other contraceptives. There are some forms of birth control which work, at least in part, by killing a conceived child. Since that is a form of murder, Christianity and Catholicism are in agreement concerning those methods. However, there are some methods which prevent conception from taking place. It is here there is disagreement.
Sex serves a legitimate purpose separate from reproduction. Paul tells us that sex is an expression of marital affection and a means of controlling sexual desires (I Corinthians 7:2-9). It is expected that couples enjoy sex (Proverbs 5:18-19). In fact, we can see from these teachings that couples are permitted, expected, and even commanded to have sexual intercourse even if the conception of children is not desired or possible at the time of having sexual relations. The use of contraceptives is simply another tool to control the course of nature for man’s needs and enjoyment. There are times when having children would not be wise. For example, when a wife is having health problems, when a couple is older and a pregnancy might risk the woman’s health or carry a high risk of producing a defective child, or when a couple is not financially able to support another child. Sexual intercourse is required in a marriage and avoiding sex simply to avoid having a child is not right.
For more information on this topic, see Contraceptives.
It is hard to pinpoint what "and stuff" refers to, so I can make further comments. But if you want to ask about other topics, I'll try to answer them as best that I can.