Jesus Christ (AS) never said that he was a god or son of God. The oldest texts about Christianity have no such claim frm Jesus, his mother, or any of his sincere disciples.
This claim of trinity was created by some people hundreds of years after Jesus (AS).
Mut'ah marriage is the solution to sexual problems of people who can not have permanent marriage, and this problem existed all the times. We believe that the faith of all the prophets is same buy their Shariah differs according to the situation of their communities. We have no details of the Sharia of previous prophets but we believe that Allah (SWT) did guide people in every time to the solutions of their problems including their sexual needs.