'O God' in the Bible

You also, as living stones, are built up as a spiritual house, to be a holy priesthood, to offer up spiritual sacrifices, acceptable to God through Jesus Christ.

Because Christ also suffered for sins once, the righteous for the unrighteous, that he might bring you to God; being put to death in the flesh, but made alive in the spirit;

This is a symbol of baptism, which now saves you?not the putting away of the filth of the flesh, but an appeal to God for a good conscience, through the resurrection of Jesus Christ,

For to this end the Good News was preached even to the dead, that they might be judged indeed as men in the flesh, but live as to God in the spirit.