Well. I myself am a Deist.
I believe that, first and foremost, God wants us to behave morally. Secondly, I believe that God gave us the ability to reason, and wants us to use said ability to reason. Third, I believe that God has a Heaven set aside for the souls of those who behave morally.
Deists reject as false any religion based upon a set of books or teachings that claim they are the literal and unerring word of God. We also reject prophecies and miracles as being false.
Now, Deism gets a little individualistic after those basic tenets. I blame this on the fact that there is no real Deist Bible or Church. Deism has many famous Deists, such as John Locke and many of our Founding Fathers (Thomas Jefferson, Benjamin Franklin, and John Adams come to mind), and David Hume (who happens to be one of my favorite philosophers). Some, including myself, hold these men to be Deistic Teachers, of some sort. We don't worship them, but we hold their arguments on the basis of Deism to be true. What I'm saying is don't expect me to be take a religious holiday on David Hume's birthday.
I'll just outline what I, myself believe. In order for God to hold moral behavior as a necessity for Heaven, he must seed such ideas of ethics and morals into our very being at birth. Therefore, we are all born with an idea of what is Good. Whether or not we turn out Good is our own choice, something that can be seen throughout the world. How many times do horrible, abusive parents produce children that want nothing more than the happiness of their fellow Man? How many times do great, loving parents come up with homicidal maniacs as children? It's all based on an individual choice, which God gave us the ability to make at birth.
I may reject the world's religions as false, but I do not automatically condemn their masses of believers as Hell-bound. The teachers Abraham, Moses, Jesus, Mohamed, Buddha, and the like had very real and very true ethical teachings. The true followers of their respective religions thereby follow these ethical and moral teachings. So they get into Heaven. The same applies to every religion in the world. Hell, if Satanism teaches morally correct ways to act, then Satanists get into Heaven. God makes no qualms about why you act morally, as long as your actions mesh with the moral teachings he gave to you.
I mesh science with my own faith by prescribing to the Watchmaker metaphor often offered by religious scientists or religious people who aren't blind to the idea that God may very well not think all scientists are going to Hell for their infernal calculators and thinking that the World is older than 6000 years. God made the Heavens and the Earth and all of Existence through the creation and application of Scientific Laws. The Big Bang, Evolution, Gravity, Laws of Thermodynamics, all of that is the work of God. We use our ability to reason, which God gave to us at our birth, to identify these Laws.
By a very incident of having these beliefs, I also believe that God would not be angry if people were to then use such knowledge to better ourselves. When science understands how to use genetic engineering to make sure we never have another child born with Tay-Sachs or any other genetic abomination, then why would God be angry if we were to use such knowledge? To me, it is not acting as if we are God ourselves. It is acting on the ability to reason and the ability to act morally that he gave us to better the lives of our fellow Man.
This is how I can go about my life. I simply could not believe in a God that would actually condemn a moral man to an eternity of suffering simply because he didn't believe in a certain religion. I also could not believe that many centuries of science that has been tested over and over, again and again, was wrong because they dated the world to be millions of years old. I had to find a way to mesh these ideas, and I did.