Use a high-quality automotive windshield urethane adhesive such as 3M PN 08693. It comes in 10.5-ounce containers and requires a caulking-type applicator. Cut the tip at an angle, just so the opening is slightly narrower than the channel. Apply a solid bead all the way around the channels where the glass will lay. Let it cure for 10 to 15 minutes once it's on the channel.
Butyl tape is no longer a recommended for glass installation. Butyl tape can only hold, at best, 60 pounds per square inch. Urethane adhesive will hold 600 pounds per square inch and has much better sealing qualities.
After the 15-minute cure time, lay the glass evenly onto the channel surface, then make sure the bottom rests on the windshield setting blocks. Gently but firmly push the glass down so it lays flat. You should see the urethane flatten out around the perimeter of the glass when you do this. Before you close the doors, make sure at least one window is rolled down. This is to prevent the pressure that is created when you close the door with the windows closed from potentially blowing the glass off the surface. You may not see it, but it will show up later as a leak.
After 24 hours, leak-check the glass; if everything is good, the reveal moldings can be installed. If there is excess sealant oozing out on the inside, this can be carefully trimmed with a single-edge razor blade.
Good luck with the installation, and thanks for the compliments!