Jehovah's Witnesses as a body, by their very name are not witnesses to the glory of Christ, however..
...there are authentic Christians within the ranks of the Watchtower. They just haven't seen the true glory of Jesus yet.
Acts 1:8 But you will receive power when the Holy Spirit has come upon you. You will be witnesses to me in Jerusalem, in all Judea and Samaria, and to the uttermost parts of the earth."~Jesus
Revelation 5:12-14 Saying with a loud voice, Worthy is the Lamb that was slain to receive power, and riches, and wisdom, and strength, and honour, and glory, and blessing. And every creature which is in heaven, and on the earth, and under the earth, and such as are in the sea, and all that are in them, heard I saying, Blessing, and honour, and glory, and power, be unto him that sitteth upon the throne, and unto the Lamb for ever and ever. And the four beasts said, Amen. And the four and twenty elders fell down and worshipped him that liveth for ever and ever.
When a JW realizes that Jesus is worthy, not just some recycled angel, they are changed.
Matthew Henry's Commentary;
v8-14 It is matter of joy to all the world, to see that God deals with
men in grace and mercy through the Redeemer. He governs the
world, not merely as a Creator, but as our Saviour. The harps were
instruments of praise; the vials were full of odours, or incense, which
signify the prayers of the saints: prayer and praise should always go
together. Christ has redeemed his people from the bondage of sin,
guilt, and Satan. He has not only purchased liberty for them, but the
highest honour and preferment; he made them kings and priests;
kings, to rule over their own spirits, and to overcome the world, and
the evil one; and he makes them priests; giving them access to
himself, and liberty to offer up spiritual sacrifices. What words can
more fully declare that Christ is, and ought to be worshipped, equally
with the Father, by all creatures, to all eternity! Happy those who
shall adore and praise in heaven, and who shall for ever bless the
Lamb, who delivered and set them apart for himself by his blood.
How worthy art thou, O God, Father, Son, and Holy Ghost, of our
highest praises! All creatures should proclaim thy greatness, and
adore thy majesty.