Imams have no power to condemn anyone to hell except themselves by their own actions. Revelations 20th chapter:

"And I saw the dead, small and great, standing before God, and books were opened. And another book was opened, which is the Book of Life. And the dead were judged according to their works, by the things which were written in the books. The sea gave up the dead who were in it, and Death and Hades delivered up the dead who were in them. And they were judged, each one according to his works. Then Death and Hades were cast into the lake of fire."

In Matthew the 7th chapter, Jesus said:

"Judge not, that you be not judged. For with what judgment you judge, you will be judged; and with the measure you use, it will be measured back to you."

So in fact, those IMAMS condemn themselves to Hell when they proclaim that they condemn another soul to Hell. So keep on chanting and talking - Eternity is FOREVER.