Is imagining a certain form, God forbid, as Allah during childhood considered an act of disbelief (kufr), and is repentance from it obligatory?

The answer indicates that the questioner is afflicted with waswas (obsessive whispering/doubts), and it recommends treating it by completely ignoring these waswas, refraining from indulging in them, and asking Allah for well-being from them. It also states that her laughter is neither a sin nor an act of disbelief (kufr).