Do I need to take ghusl to repent from deviant sect?

[SintoDinto]

Or recite the kalimah officially? I recited it in passing but I didnt perform ghusl. I heard the sahaba performed ghusl to accept islam must reverts now do it? Even from a deviant sect? I'm converting from nurculuk, a belief which includes that is second descent may not be literal, that malhama al kubra already happened in ww1, that amjad to predict when world will end is valid, that Lenin is dajjal, that ataturk is sufyaani, etc and many bidats

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*abjad

[SintoDinto]

Isas second descent