Today God dwells in his people, for they are his temple. The gospel is the good news that the kingdom of heaven has broken in among the kingdoms of this world. Believers in him are reconciled to God, given eternal life and receive the Holy Spirit. They have entered a covenant relationship with him. God writes his eternal law on their hearts and they are converted.
Paganism is at odds with the gospel.
One cannot believe in paganism and believe the Christian gospel. The theology and ethics of the two are in complete opposition with each another. Where paganism is polytheistic, Christianity is monotheistic. Where paganism is sensual, Christianity is temperate. Where paganism is materialistic, Christianity rejects materialism.