Christianity, Judaism, and Islam have much more in common than their perceived differences.
In fact, they share pretty much the same story through Abraham. That is a lot of shared history and belief. Of these Abrahamic religions, Judaism was founded in the 7th century BCE, Christianity in the 1st century CE, and Islam in the 7th century CE.
They have shared ideologies, practices, and general tenants on how to treat people. in addition, here are 5 big similarities:
1. They are all monotheistic
2. They all worship the God of Abraham
3. They believe that God is the creator of the universe
4. All three originated in Southwest Asia
5. All desire/require space for prayer and worship
Interestingly, they have shared positives and negatives. The negatives always involve power and control. The positives are about love.