See if it's possible to attend a worship service at Ahrida Synagogue. You'll learn about some of the customs and practices of the Jewish faith.
If you're spending a while in Istanbul City Center, Ahrida Synagogue is a good place to start your sightseeing. This Jewish house of worship is one of numerous attractions that'll keep you on the go here. Blue Mosque, Hagia Sophia, and Topkapi Palace are also ready to be explored nearby.