Judaism and Islam shere the belief that ________?

You mean "share," right?

Both these religions are monotheistic. Here's the definition:
http://www.answers.com/monotheism

Judaism and Islam share the belief in monotheism, which means they both believe in the existence of only one God. To confirm this belief, you can refer to their respective religious texts: the Torah in Judaism and the Quran in Islam.

To find this information, you can:

1. Research Religious Texts: Access the Torah and the Quran through both physical copies and online resources. Read their respective texts to gain a deeper understanding of their beliefs, teachings, and principles.

2. Consult Scholars and Religious Leaders: Seek out experts in Judaism and Islam, such as religious scholars, theologians, or leaders from these faiths. They can provide insights based on their knowledge and interpretations of their scriptures.

3. Compare Sacred Texts: Analyze the similarities and differences between the Torah and the Quran. Look for passages or verses that explicitly state their belief in monotheism or explore the oneness of God in both religious texts.

By exploring these resources and approaching the subject with an open mind, you can find the evidence and foundation for the shared belief in monotheism between Judaism and Islam.