To cause a source to be biased means that it is influenced by your opinion or another factor that is not factual. Bias can take away from the credibility because it is not completely true, as a source should be.
Jewish people pray in a synagogue, just like how a church is for Christians.
Sabbath is a day where the Jewish people have a religious observance.
Kosher is the type of foods and drinks Jewish people consider religiously restricted, like how some foods have to be halal for Muslims to eat.
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On the ground floor aisles were placed to the left and right of the nave, and were open to pedestrian traffic, hence they were called ambulatories. Above each ambulatory was a triforium, a series of arches lit by windows kept out of sight from below. At the top was the clerestory, a series of windows that allowed light to come streaming through. Shortly after construction, the builders decided that the unfiltered light was too bright for the inside of a church, and the glass was stained so that the church was filled with various colors. Hence a new art form, the art of stained glass windows, was born.
It is referred to a constitutional monarchy.