You don't have to accept the reincarnation context to practice Buddhist principles. Buddhism can be helpful/useful even if you don't want to become a Buddhist.I have been interested in Buddhism since I was a kid but I can't accept reincarnation. How easy is it to separate that doctrine from the daily practice of Buddhism? Are there any varieties which do not deal extensively with reincarnation?
The first Truth is the most basic and for many the easiest to accept: craving and desire lead to attachment and suffering. Whether you believe in one lifetime or many doesn't change dukkha. Nivana is just a goal, an end point one can strive for. The eight fold path is how one can reduce the effects of dukkha and be more content. To be a real Buddhist you might have to jump fully into the soup pot and figure out what kind of Buddhist you are/want to be. You have many choices, just like in Christianity. The value of Buddhism lies in its understanding of the human condition and its ways to improve one's life.The Four Truths express the basic orientation of Buddhism: 1. we crave and cling to impermanent states and things, which is dukkha, "incapable of satisfying" and painful. 2. This keeps us caught in saṃsāra, the endless cycle of repeated rebirth, dukkha and dying again. 3. But there is a way to liberation from this endless cycle to the state of nirvana, and 4. following the Noble Eightfold Path is how you get there.
"The Way of Zen" by Alan Watts is a nice intro into Zen (Japanese) Buddhism. "Siddhartha" by Herman Hesse is excellent for basic Buddhist principles.
I'm pretty sure that the modern complexity of Buddhism is not a match for whatever the original Buddha taught. Buddhists have had 2,500 years to change it.
