Kufr

Q: If a Muslim has a doubt concerning an Islamic thing, like he heard someone say something about Islam but its widely accepted thing and he gets doubt that if its true or not. If true where is the proof? Like these thoughts. Now I he gets free time and wastes it. Will he be regarded as a kaafir?

Q: This question is very important. In fact, almost all committing this sin face this, but do not think about it and do not ask about it. Will this be a kufr to watch pornography and masturbate, in which actors pronounce the name of God during adultery and/or they utter phrases that offend God, during adultery? Will this be contentment with unbelief and with an insult to God, if muslim does not agree with these words and actions in the heart?

Q: My sister is currently set to graduate at the end of this year, after which she will join the rest of my family in Turkey. However, this term she took a biology course that had multiple chapters regarding human evolution. She is now preparing for the exam for that course, and the chapters on human evolution happen to be a large part of the exam. If she doesn't answer the questions, she will most likely fail and if not, her average would become very low, and it may effect her graduation or her ability to move to Turkey at the end of the year. Can she write a general statement like 'so and so theorized this' without any indication of agreement and without stating anything as a fact? If not, is there any way for her to answer the questions (in written form) related to human evolution without falling into kufr?

Also, from what I know, medical schools even in Islamic Countries rely on biology books that include topics like human evolution, and the students are tested on the theories. How can Muslim students graduate as doctors without getting near kufr?

Q: Someone sent me a page telling about the weirdest shows, the description of the show read that: 'A 2009 Turkish reality show where an imam, a Greek Orthodox priest, a Buddhist monk and a rabbi compete to convert atheists to their respective religion. Anyone who was persuaded to change their religion won a pilgrimage to the spiritual home of their new belief system – so a bit like Take Me Out but with less Fernando's and more, you know, Mecca.' Is this description blasphemous? Please tell me so I may report it to cyber crime authorities thank you.