In Buddhism, the Buddha is not considered a god. He is revered as an enlightened teacher and exemplar who showed the path to liberation from suffering.
In Christianity, Jesus is considered to be the Son of God, and part of the Holy Trinity (God the Father, God the Son, and God the Holy Spirit). He is believed to be fully divine and fully human.
Whether Buddha is a "real god" or whether Jesus is God depends on one's personal religious beliefs and perspective. These are core tenets of two different religions with distinct theological frameworks.