'O God' in the Bible

I give thanks to God that no one of you did I baptize, except Crispus and Gaius --

But victuals do not commend us to God, for neither if we may eat are we in advance; nor if we may not eat, are we behind;

to those without law, as without law -- (not being without law to God, but within law to Christ) -- that I might gain those without law;

no, but that the things that the nations sacrifice -- they sacrifice to demons and not to God; and I do not wish you to come into the fellowship of the demons.

In your own selves judge ye; is it seemly for a woman uncovered to pray to God?

for he who is speaking in an unknown tongue -- to men he doth not speak, but to God, for no one doth hearken, and in spirit he doth speak secrets;

and if there may be no interpreter, let him be silent in an assembly, and to himself let him speak, and to God.

then -- the end, when he may deliver up the reign to God, even the Father, when he may have made useless all rule, and all authority and power --

and to God -- thanks, to Him who is giving us the victory through our Lord Jesus Christ;