All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His slave and Messenger.
Whatever you took from the church could be resolved by spending it in the public interest. It should not be returned to the church for fear it might be used in something unlawful. The jurists have explained that a non-Muslim’s endowment for a church is considered invalid, because such is disobedience (to Allaah).
Al-Kharashi said in Sharh Mukhtasar Khaleel: "Endowment for a sin includes when the non-Muslim endows something for a church, whether for its worshippers or its upkeep, since they (the non-Muslims) too are addressed by the obligations of Sharee’ah, according to the official opinion [of the Maalikis]." For more benefit, please refer to Fatwa 85569.
As such, what you took from the church, either it can be returned to its original owners, which is quite probably not possible, so it should be spent in the public interest, like on hospitals, roads, schools, etc.
Likewise, whatever you took from the state without right and there is no way to return it, even indirectly, then you can spend it on the poor and needy and also on the public interest.
As for participating in an insurance policy, if it involves that which is forbidden, then it is not permissible. We clarified that in Fataawa 86414 and 85479.
But if it was a permitted type of insurance, i.e. a cooperative policy, then there is nothing wrong with that. However, it is not permissible to try to evade its conditions, due to the saying of the Prophet, sallallaahu ‘alayhi wa sallam: “Muslims are bound to their conditions.” [Abu Daawood - As-Suyooti graded it Saheeh (sound)]
For more benefit, please refer to Fatwa 81425.
Allaah Knows best.