Re-read your post. Your son has already told you he doesn't want to do it.
He also tells me he doesn't want to do his math homework or go to school.
He's still a kid. Does he really know what he wants to do? As a parent, what role to we take to provide guidance? If he did what he wanted to do, he would live on snickers bars and x box.
Parents make kids go to school and do homework because its required. Parents limit snacks and activities for health reasons. But I don't understand how a parent can force a kid to participate in a certain extracurricular activity. It seems like a way to make him hate the activity. The kid likes basketball. There's nothing wrong with that. It appears he likes baseball when he feels its time to play baseball. The passion to do more has to come from the kid, not the parent.
I've heard stories in person and on boards of dads claiming their preteen lives for baseball. The dad constantly has him out practicing claiming the kid wants it. Then when the kid becomes a teen the dad can't figure out why the kid doesn't have the same passion. Plus other new interests come into play. Preteens please dad. Teens try to please themselves. Only the kids with true passion survive a sport.
I coached a kid in 13\14 rec basketball who had so much fun he gave up baseball (he had talent) to play basketball year round. His father was ticked at ME. The kid told me basketball was fun because his father didn't know the game well enough to do a post game dissection on the ride home. This kid never made varsity basketball. He would have started varsity baseball junior year. His brother played college ball. His dad was a baseball coach. The kid is still playing organized basketball (intramurals) in college.