Theres not a single religion on the face of this earth that can compete Islam. I am a firm believer of Islam. Every single word written in Quran is what i believe the final word of Allah. Any new religion which is born after Islam is fore sure not from Allah. No commit have i committed by accepted the Imam Mahdi AS and the Maseeh e Maood. I also request you to think of ahadith as not literal meaning all the time. Even in Quran there are metaphorical verses for us to understand, so are in ahadith.
I am not a believer of Maseeh e Maood whose sole purpose is to kill the people who dont accept him. In Quran it is said that the duty of a messenger is to convey the message to the people and leave Allah to soften their hearts. No prophet has ever come whose purpose has been to kill the people who disobey his teachings.