Amy, I see the ACRT are confusing correct use of participles with the age old mantra: If I tell someone something enough times they will believe it, the white paper is red that eventually a person will believe that white is red and red is white. "The sky is falling, the sky is falling" well this is the ACRT drum roll and they are as confused as ever. The participle in Eph. 1:13 functions as a verb so don't let them say it is doesn’t. The participle is used this way as a verbal substantive and they know that but are just trying to confuse you. As a participle it has the charities of a verb and noun and functions like a verbal adjective. Don't pay them any mind they are confused by their ongoing determination to redefine words and twist meaning. They have been at it so long they actually believe what they preach. We will just continue to love them in their craziness. “197. The participle, like the infinitive, is not a mood but a verbal substantive.” DM page 220.