Yeezy faithful flocked to The Forum Wednesday to get a listen to Ye's latest project ... the floor of the arena was covered in long grasses to resemble the field where he first started Sunday Services.

The event -- which was a no-phone zone (except for Kim) -- started out with a screening of Kanye's "Jesus is King" IMAX film ... a 30-minute glimpse inside the Roden Crater with sounds from a gospel choir.

Then, Kanye appeared on a makeshift stage in the middle of one of the patches of long grass to play his album. Fans went nuts, crowding around Ye to vibe to the new music.

As for the album ... the production is top-notch, as expected, but the lyrics are noticeably different than Kanye's other stuff. It's totally gospel-based, with mentions of Jesus and being saved throughout ... there's also minimal -- if any -- cursing.

And yes, there was merch ... fans lined up deep to grab $170 sweaters and $45 hats.