If he does it intentionally, his prayer is invalid.

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We believe that witchcraft exists and that it is true. However, it is not permissible to deal with it or practice it as this is an act of kufr.

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It could be a test or punishment. It is completely prohibited to think negative of Allah like this and attribute these calamities to wanting to become more religious. These are whispers from Satan. 

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Reciting Surah Fateha is obligatory, the other Surah after that is a Sunnah whether in loud or silent prayers, including Imam. You will be missing out on the reward though if you skip the other Surah. The follower is not allowed to recite anything in loud rakah except the Fatiha. 

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