If god made Adam, why did he give him nipples?
Because God used a chimp predecessor template as man's starting point and apes all had nipples.
I'm guessing that this question is inspired by the expression "useless as teats on a bull".
Well, I have learned something that my wife and I regularly exploit; tits on a man and tits on a woman who is not lactating, are not at all useless. Far from it.
Besides all that, the question of whether Adam had tits, a navel, or was circumcised are unanswered, and anyone who tells you he knows the answer isn't using the KJV of the Bible anyway, so you should ignore him.
Under a government which imprisons any unjustly, the true place for a just man is also in prison. Thoreau: Civil Disobedience (1846)
I have never met a man so ignorant that I couldn't learn something from him. Galileo Galilei
If there is no struggle, there is no progress. Those who profess to favor freedom, and deprecate agitation, are men who want crops without plowing up the ground, they want rain without thunder and lightning. Frederick Douglass