So, I was raised a Methodist Christian, but I have had some problems with it. So I have some questions about Buddhism.
1. What does it believe as far as self-discipline? That's one of the potential aspects that attracts me to it.
2. Is it really a kind of agnosticism? Forgive my ignorance, but if I don't ask it I'll never know.
3. What are the ideas concerning Dharma?
4. Are the guidelines to reach enlightenment strict?
Okay! But, if I had failed to ask about something I should know, please say it! I'd rather have too much information than too little when it concerns this.
You may be gathering from these responses that it's not as simple as that. To paraphrase a Buddhist master: to explore Buddhism is to explore the Self.
Honestly, if you want to find out what Buddhism "is" or what Buddhism "means" or "believes," begin practicing. Read Sutras. Read commentaries. Meditate. Meditate a lot. Talk with seekers and masters. Critically examine what you read. Feel free to disagree on whatever point you like. I've read plenty of Buddhist material with which I disagree strongly, including stuff written by very respected masters (I have deep problems with parts of what H.H. the XIV Dalai Lama is teaching, for example).
Buddhism is, in the end, a practice before all else. To be Buddhist is to walk the Buddha Way, whether that is the acceptance of the Precepts and Eightfold Path or the Prajnaparamita or some weird-*** Vajra World stuff. Important schools of Buddhism differ radically on what others would consider key points of thought. Individual schools teach individual doctrines, but most teachers will tell you that doctrines are teachings to bring one to enlightenment, and that's why contradictory doctrines exist: many paths, one mountain, blah blah blah.
Anywho, if you have want clarification regarding individual sects (because to talk about "Buddhism" in general is very difficult), I recommend hitting up the individual Buddhist DIR's. I can't speak to the Mahayana, Theravada, and Vajrayana DIR's, but the Zen DIR does a good job of discussing questions pretty damned well.
One last note: don't take anything anyone says about Buddhism or the Buddha too seriously until you've understood it for yourself. Shakyamuni Buddha's last words were an admonition to all his students to be their own lamps in the darkness and to not take even his words on faith alone.