"How would you feel about having your child being taught a faith other than your chosen faith?"
Firstly, I don't think you can be "taught a faith".
If the collective worship was moderate and non-fundamentalist I'd probably be happy for my child to attend. Indeed, worship of a "broadly muslim" nature is probably not much different from "broadly christian" in terms of values, consideration for others, appreciation of the possibility of a God etc.
I would continue to practise Christianity at home. I'd tell my child I wasn't a muslim and describe the things our faiths have in common, as well as where they differ. If I was in a country with a long-standing muslim heritage I would take that into consideration too.
"If in this situation, you elected to opt your child out of the collective worship (which you are entitled to do), how would you feel if your child was bullied by the other children for being different?"
Can you give me even one example where a child has ever been bullied for not taking part in collective worship?
If it did happen, I'd complain to the school. Most schools have an anti-bullying policy. There are all kinds of ways children can be bullied for being different, whether it's hair colour, musical tastes, clothes, accent, sexuality or anything else. The problem is the bullies, not difference.
"Is it not a basic human right for your child to go to school and feel safe and feel the same as the other children?"
To feel safe, yes. To feel the same as everyone else, not necessarily.