Fly Rods

People said fighting disease was 'playing god'

People said lightning rods were 'playing god'

People said using electricity was 'playing god'

People said cars were 'playing god'

People said chemistry was 'playing god'

People said dissections were 'playing god'

People said genetic research was 'playing god'

People said breeding animals is 'playing god'

So why exactly is cloning or growing organs any different than any of that? You're doing exactly what religious people have done since the dawn of science