There are two kinds of happiness really.
But once again, we get back to the same ad-hoc reasoning that led you to conclude that Christianity isn't a religion simply because it's the faith that you adhere to, unlike the others.
What you're saying is that there's the kind of happiness that comes from satisfaction with a society that at once protects people and allows for personal choice; and then there's the kind of happiness that comes from religious self-delusion.
Just because you have different delusions than other religions - God talks to you, you're in a love relationship with him, etc. - doesn't make your religion fundamentally different than any other. Just because
War and Peace is its own unique story doesn't mean that it stops being a book.
Christianity is the only religion where God has done all the work for us.
The problem for you is, this isn't a universal view of Christianity. Slavic Orthodoxy, for instance, holds a synergistic view - personal volition is required to attain grace and salvation. God doesn't "do all the work".