What is the conclusive proof that Islam is the true religion, taking into account the questioner's doubts about Islam and his preference for Christianity, and his rejection of using prophetic hadiths as evidence?

Islam is the true religion. The questioner's problem lies in being raised as a Muslim by inheritance without seeking knowledge from its correct sources, and being influenced by the behavior of some Muslims and their material backwardness. He should blame himself and those who ascribe to Islam, not Islam itself. Islam encouraged knowledge and contributed to the advancement of civilization. The backwardness of Muslims is not due to Islam, just as the West's progress is not due to Christianity, and history testifies to the church's hostility to science.

The Islamic religion is a religion of peace and tolerance. Jihad within it is for spreading the call, not for indiscriminate killing, and there are strict controls for Jihad. Previous laws have been abrogated by Islam, and the current Christianity has been corrupted. Furthermore, the questioner's accusation that 99% of the Sunnah is based on lies indicates ignorance of the methodology for scrutinizing the Sunnah.

Finally, what the questioner mentioned in his question is considered apostasy from Islam, and apostasy is a serious matter whose harm falls upon the apostate himself.