Do mormons,jehovah witnesses,adventists, baptists ? claim to be the true churches of Jesus christ?

why is that? also pentecostal movements? so they believe they are the true church different from lutherans they claim their church is a reformed church of the catholicism but never a new church, just a reformed church but those groups like mormons, baptists,jehovah witnesses, adventists of seventh day, and pentecostals? believe they are the true church why is that? I have met people from those churches and they claim their church is from God