Well no, christian theology doesn't say that God the Son is the male offspring of God the Father. That would make no sense, because God is not caused and is not male. However, there is sometimes a confusion among non christians because christian theology says that the Son was incarnated, and so became human. The Son is therefore God and a male human at the same time, and we call him Jesus. And people sometimes think that we call him "Son" because he's a male human, but it's not the case. The Son was not created (only his human nature was), and if we call him Son, it's because he's the intellectual image God has of himself. Indeed, God is omniscient, and therefore knows himself perfectly. Therefore the intellectual "concept" he has of himself is absolutely identical to himself, and is God himself. That's why saint John refers to the Son as the Word in the beginning of his Gospel (Word is a translation from Logos, which can mean word but also thought). And since God is his own intelligence and his own thought (the thinking of thinking, as Aristotle says) he is one with his own concept. Therefore there is one God, but there is a point of view in which he's thinking himself (the Father), and a point of view in which he's thought by himself (the Son). Those two points of view are really distinct in God, but not separable.