When looking for a good toy for church you need to keep a few things in mind. These are extra things in addition to making sure the toy is age appropriate for your child.
Firstly the toy should not only be quiet but it should encourage your child to be quiet. Some toys even though they don't make any noise naturally lead children to create sound effects. A toy airplane might be one example of a toy like this. If the toy has small pieces they also shouldn't be noisy if they are dropped onto the floor. This is important because children's co-ordination is not fully developed so dropping things or knocking them over is common with kids.
The toy shouldn't be messy. So it's best to avoid toys that have lots of small pieces that would be hard to clean up. Many art supplies are also not a good idea. This is especially if they are in the hands of a toddler.
Finally, the theme of the toy should be suitable for church. This means it's best to avoid toys that may be thought of as aggressive (like many electronic games). You may also need to stay away from toys with themes that you think are unsuitable for your church.