Does the foundation of faith remain in the heart of one who testifies to the two testimonies but commits some acts of shirk (associating partners with Allah)?

Question:
If a person commits some acts of shirk (associating partners with Allah) but testifies that there is no god but Allah and that Muhammad is the Messenger of Allah, does the foundation of faith remain in his heart?

Answer:
No, if he commits major shirk (associating partners with Allah), then the testimony that there is no god but Allah and that Muhammad is the Messenger of Allah is invalidated by major shirk, because this is a nullifier, indeed it is the greatest of the nullifiers of Islam. Therefore, merely uttering the two testimonies while committing major shirk is not sufficient. Yes.