ANSWER:

Saying the shahadah to enter Islam must be done with conviction! 

If this apostate doesn’t repent from his kufr and says the shahadah without repentance or remorse, he is a hypocrite pretending to be muslim.

If a person becomes an apostate, is repentance a requirement, like the shahada, for coming back to islam? For example if one said words of kufr, then after that said the shahadah, but did not repent, is he considered to have come back to islam?