Well it's very hard to believe in God.
The New Testament of the Bible is only made after Jesus came to the earth, some people don't believe that Jesus was a saviour, for example, Judaism, Islamic, and Muslim who don't believe in the New Testament of the Bible, only the Old Testament of the Bible.
Here's my proof, go grab your bible and open it, you will find there's two, Old and New Testament in just one bible. That's Christianity Bible (including its root like Mormons, Catholic, etc).
If you are not interest into Buddhism, don't continue reading the rest of this post.
Even I am Theravada Buddhism, I feel like Jesus is a foregin to me and is a believeable. Also there's God introduction to Buddhism, there's lot of Buddhist people believe into God and follow Buddha's guide and reading the Bible same time (which what I am doing right now). While I study about what Buddha taught, it help me to understand about living and suffer, how to let suffer go, and how to live in peace and joy, etc.
Anyway, I better shut my mouth about Buddhism, but it always help me while I want to believe into God.
"What you think, you become" - Siddhartha Guatama (Buddha)