Earth worship is definitely a religion. Anyone I have met that wants to "save the earth" has no concept of what will happen to earth when our Lord returns. Read Revelation some time, "the elements will melt with fervent heat", is one of the descriptions. In the end it will be utterly destroyed by its creator and a new heaven and earth will be made to last for eternity.
It sure is. Go to one of those Earth rallies sometime. Scary.