No, this is not kufr.

This is wishful thinking and hoping for the best.

If a person says I will do good deeds when I grow up, or if he believes that he will live until the next day will he become a kaafir?

Apostasy | January 25, 2014 3:20 pm
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What about the one who prays his five prayers , but his prayers are not accepted because of impurities on the place he is praying on, is he counted as a disbeliever?
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If amuslim doubts about Quran and says it might not be 100 % protected. Does this make him kafir?