The real guy was Joshua son of Joseph, he earned the title Jesus Christ (greek) by sacrificing his life for our sins, whether or not you think that means anything is your own decision, but you can't claim Jesus wasn't the savior without bringing some evidence to the table.
The second part of your post I found amusing, simply because it seems so preconceived. Have you studied the scientific history at all? Linnaeus, Mendel, Mendeleev, Avogadro, and Lavoisier all born of Christian faith and all educated by different aspects of Christianity. None were held back by Christianity, in fact their Christian upbringing is probably one of the biggest factors in their success, and without them we would be hundreds of years behind. But I would have to agree that the Catholic church did stall the inevitable for a short time. Regardless, Islam had our back scientifically during those dark days. The Muslims brought weed to Spain in the 10th-11th centuries, which marks its first documented cultivation of the plant in western europe(random, I know). So don't be so quick to bash religion based on your interpretation of history, there are a lot of diamonds in rough, pardon my Aladdin.