Science is a faith
Science is a faith is a statement that reflects a straw man argument propagated by apologists to attempt to discredit "belief" in science as being no more logically sound than believing in a religion. However, this represents a categorical misunderstanding of science, which is explicitly based on logic, with ideas developed through demonstrable, repeatable experiments or studies. Many religions, on the other hand, are based solely on, as inherent to the argument, faith.
Development of Scientific "Beliefs"
Most respected scientific papers, a key step for introducing new concepts into widespread belief, are peer-reviewed, in that other scientists in the relevant field are able to judge the experiment or study detailed in the paper for soundness of both experimental design and conclusions reached. Additionally, the process described should, when replicated, produce results that support the same conclusion -- scientists continually replicate and often refine experiments in order to test the validity of claims and refine theories. Claims that scientists make, therefore, are supported by developed systems of logic and reason. Anyone with the resources to replicate an experiment or the intellectual capacity to criticize conclusions is free to do so, leading to a continual development of more complex scientific concepts through more nuanced understanding of our world.
In fact, the reliable functionality of so many of our modern technological conveniences rely heavily on the replicability of science. For example, modern telecommunications technology, which use the exchange of "packets" of encoded information over a myriad of mediums, from wireless technology to fiber optics, is able to, with incredible accuracy, relay complex information in a way that can be decoded by the recipient. While there is always the possibility of error due to unforeseen or unaccountable occurrences, the integrity of the data is far more often than not preserved and not due to "faith" in the functioning of the electronics, but rather to the collaboration and continued efforts of not only scientists, but also business men and maintenance workers, who all work together to maintain to the standards of the technological model.
Religious beliefs, however, are supported most often solely by faith alone. The Christian evangelical who promises the potential convert a paradise after death has no means to demonstrate their claims any more than the mere existence of God. Relying on outdated "sacred" texts and dogma, their beliefs have no basis for logical understanding and rely simply on accepting these works as factual, without any logically sound basis for this belief.