Try to understand Islam.
The Quran has never been changed, and it has science in it, and many predictions that have come true. In the Quran there are no contradictions, you can tell that it's not B.S. if you actually look at it, not just listen to what the media has to say. Altamira.com is a great website to find out the truth about it-if you actually want to find something that's more.
Here is a new article on What Do Jehovah's Witnesses Believe:
http://www.watchtower.org/e/jt/article_03.htm
For instance; many people think the whole planet earth will be destroyed. That is not true because our earth was designed to be inhabited. The first human pair (Adam & Eve) lost Paradise; but SOON that will be restored to earth. Consider:
Psalms 115:16 As regards the heavens, to Jehovah the heavens belong, But the earth he has given to the sons of men.
Three very different religions. To understand them, you are going to have to do your research first.
Read their main books first. Going to a group of people that are irrational and hates another group is an insane way to do research.
Books that have been around many many years, will tell you how a certain religion believes. Not books that are peripheral, but the primary books. That is how you get to know a religion. Sometimes you get to know a religion better then the people who go to that religion because you read their main books.
All three religions have books associated with them, that are some of the all time bestsellers in book history. The Bible is of course, the most widely distributed and published book in History.
The Book Of Mormon, for Mormons is essential reading, if you want to understand the LDS faith.
For learning about Scientologist you would start by reading the book titled Dianetics, by L. Ron. Hubbard.
For Jehovah Witness you would want to read their literature that they hand out, and any book that has been held in high esteem by them over the years.
God gave you a brain, he intended for you to use it to help you make up your own mind, on various questions of the day.
The most important question is which church is Jesus Christ's church. Only a person who is honest with themselves and with God, will find the true church of Jesus Christ.
Everyone has a tendency to think that they are right. But only one is good, and that is God. And only one is wise, and that is God.
Therefor relying on God, is the only logical thing to do, when pursuing any kind of knowledge, but most especially religious knowledge, the crown jewel of all truth.
I think you need to stop going to websites and forums like this one asking ignorant people questions about each religion and research them yourself at their own websites that they made themselves.
I like the way the Scientology guys here use the term "betterment" groups and label critics as "bigots" which is laughable. Bigotry is ignorant discrimination, it is no crime to be critical of any group if logical arguments are expressed.
Do not let anyone tell you whether they are or are not bullshit - it is for you to research and find out for yourself. But if I had to my answer to you would be all religion is BS - man made and self serving with a basis in primitive nonsense and superstition. Of course there are positive elements to all (for example maybe a church will org anise some charitable events to help out etc.) when I speak out against religion I look at the big picture of the higher institution of it and not only do I smell corruption and lies - I see it.