What should I do to get rid of obsessive thoughts and ideas about death, the grave, and the resurrection, which have started to extend to doubting religion, Islam, and the Qur’an?

You must turn away from negative thoughts and avoid doubts, strive to understand the religion deeply, and associate with righteous people. The souls of believers enjoy bliss in Paradise before the Resurrection. The souls of martyrs are in the crops of green birds, roaming freely in Paradise, and they wish to return to their bodies to be killed in the way of Allah once more. As for the soul of a believer, it is in a bird that hangs in the trees of Paradise.