Aren't the ten things brought by moses the only god words?

Not that much of a faithful protestan christian here. Aren't the 10 sentences on the stones brought back by moses... The only words god ever "spoke". Then people argue that jesus was god. Well whatever. I can understand that the believers wanna follow what their master says but damn... Usa christians use the old testament therefor the jewish rules against gaymarriage and such. What do you think?