I agree, Millennium Visions is very heavy in content and this is something that the CDT will be following up in the Autumn term.
At my own school, we have started to look at themes that are being taught across the year groups and how the RE might fit into them, with philosophical questions underpinning it. So, for example, we've had a theme on Journeys, which has enable pilgrimages to be taught, but with Year 5 and 6, not just Year 6 where it's normally taught. We've also encouraged other year groups to look at the 6 religions if it is relevant to their themes. I'm sure it's what you're doing already, but until there has been a discussion about whether to continue to use Millennium Visions, then we are trying to use it in a more creative and appropriate way.