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Kanye West may have his biggest audience yet for a Sunday Service, because we've learned he's agreed to take the stage for Joel Osteen's incredibly popular Sunday ritual.

Sources with direct knowledge tell TMZ ... Ye and Joel have been talking fairly regularly recently ... they've become friends, especially since Kanye has doubled down in his devotion to God.

We're told the plan is for Kanye to show up at Joel's 11 AM service in Houston this coming Sunday at the Lakewood Church. Kanye will walk up to the pulpit and have a conversation with Joel that will last between 20 and 30 minutes.

Our sources say Joel wants his congregation -- which stands 45,000 strong -- and his TV audience -- which stands at 10 million in the U.S. alone -- to hear how Kanye has overcome significant adversity in his life.

As one source put it, "Kanye used to be about nothing greater than himself. Now it's all about a higher power." BTW, Kanye has echoed this sentiment before. We're told Joel will ask Kanye to contrast his life then and now.

We're told Kanye will not perform at the 11 AM service, but Joel has other services later in the day so it's possible Kanye would stick around. He doesn't seem to go anywhere on Sundays without his choir, so it would not be at all surprising if they show up in H-Town this weekend!

BTW ... the service will be broadcast live on SiriusXM.