Lakeland, Winter Haven Route http://polktransit.com/content/routes/Route%2012%20-%20Lakeland-Winter%20Haven.pdf This might be it as the Church is located across hwy 17 from Northgate Publix which is in the southbound lane. The Church is in the northbound lane of 17 and Ave M NW which I believe is 549.
I'm sorry I can't help. I live in Davenport. I don't know about the bus routes in auburndale.
Thanks! Your answer is awaiting moderation.