RE never just included religion even when I was at school. We learnt about sex, contraception and drugs in ours, as well. I think it was a dumping ground for covering all sorts of things.
You could teach a theme along the lines of religious and non religious forms of expression of our common humanity, that could include non religious things as well.
There are lots of altruistic clubs that raise money or volunteer to help those in need, lots are non religious in nature.
Various groups could come into school and show children what they are doing around the world to help others. The Lions and their support for water aid for example. Alongside religious ones like Christian and Muslim aid as another example.
Then there are all the debates on things like abortion, vegetarianism etc.
You could cover both POV and then get the kids to argue a case themselves, for both sides.
Perhaps instead of Religious studies you could call it, beliefs and opinions time, where different ideas are discussed.
Maybe even throw in a bit of politics and even a bit about tensions and why some places have a lot of prejudice and just different POV's.
I think as long as you put both sides, equally and discuss its not an issue.
For me the whole point of RE is it gives room to discuss why the world is how it is, what different people feel, think and behave and why.
It's not about " facts" just about being more aware of the world situation and why people think and do like they do.
It's the only time children get to really discuss things, outside the national curriculum.
It's something they can join in and find out about for themselves.
That's how I would treat RE.
Use it as time to explore different opinions in our world and what often drives the news headlines ( as well as the basics of belief and different religions, forms of worship etc)
The purpose of it wouldn't be to tell a child what to believe, but maybe just to learn a bit about what's going on behind the headlines, with tensions and other people.
That includes the non religious as well.
