No, believing in God but not Jesus does not make someone an atheist.
* Atheist: An atheist does not believe in any gods or supernatural beings.
* Deist: A deist believes in a God, but not necessarily the God of any particular organized religion. They often believe God created the universe but does not intervene in human affairs.
* Theist: A theist believes in a god or gods.
Someone who believes in God but not Jesus might be considered a:
* Deist: As mentioned above.
* Follower of another religion: Judaism and Islam, for example, both believe in God but do not accept Jesus as the Messiah or Son of God.
* Personal believer: They might have their own unique understanding of God that doesn't align with any established religion but still includes belief in a higher power.
Therefore, believing in God while rejecting Jesus simply means they adhere to a different theological or religious perspective than traditional Christianity.