You can take all religions and find similarities (compare Native American beliefs to Buddhism, as an example). However, after studying many religions, from everything that I have read/studied/etc., the actual "church" beliefs of Christianity are very different from Buddhism. Christianity looking for enlightenment? no, Christians "know", they don't need to be enlightened. They also do not meditate - they pray to Christ and God. Not the same at all. Christianity and Buddhism have a lot of the same morality, but the spirituality and goals for belief are quite different.
And, if you have truly studied Buddhism, you know that the real definition of Nirvana does not exist. The definition of Nirvana will not be known until one experiences it.
You're right, we are different from animals- we have much more destructive ways, are selfish in thinking that the Earth is here to use how we want, raise animals simply for food (heck, we're too lazy to hunt), and we eat not to simply survive- but for pleasure. Let's not even talk about killing for pleasure ("hunting"). Yeah, we're worse than animals, and "we" use a book as the excuse to why it's "ok" to have "dominion". It's easier to eat a McDonald's cheeseburger when you believe that the cow was put on earth to feed you, but if you spent time with the cow and heard its cries when its calf is taken away you might think differently....if you would allow yourself to. But, If you simply think that "man" is above "animals", you will never see how harmful humans are to animals.
I like the very basic way that you put this. I know a few Buddist Christians. I call it "covering your bases", but to each their own.
To me, I don't think that a true God would have only one path to him. I think that there are may paths. I look to Buddism as one of the many ways to learn and be enlightened, though I doubt I will ever truly "know" until the end. However, I'm pretty much sure at this point that death is like general anesthetic is like- nothing. No pain, so sorrow, just peaceful non-existence. So, I live my life as peaceful and helpful as possible and try to enjoy it while it's here.