This is waswas and you have to ignore it. Get closer to Allah through learning more about the Quran and sunnah and practicing them more and these whispers will disappear.

What is the ruling on a person getting evil thoughts of becoming Christian? Is this apostasy or waswas?

Apostasy | September 24, 2015 3:46 am
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Did a person commit kufr if he, in a moment of frustration, is about to utter something that is kufr, but he immediately realised what he was about to say and immediately refrained from saying it? He didn’t utter it but it almost came out of his mouth.
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Husband and wife were muslims when they got married but now the husband converted to Ahmediyah sect. Is this marriage contract valid?