The bicameral system is a system in which the Parliament is divided into two chambers. The two chambers are usually organized in a manner of lower and upper dome. The two chambers work separately from each other, but are dependent on each other, as one of them can not pass a law without the permission of the other. This type of system is implemented so that there can never be a situation where one political side can have too much power and to be able to function independently, thus abuse the system. The bicameral system is an excellent system to protect the people and their interests.
Maybe they were never introduced to Christianity or they quit Christianity due to an accident like losing a loved one or maybe they reject Christianity due to them being a part of another religion.
"In the old days of assimilation, foreigners felt the required need to become as American as possible. America is no longer asking or demanding immigrants to abandon their birth culture."