joint legal custody

So, Xander calls me tonight and tells me that his baptism was today. I was (and still am) fucking LIVID!! Aaron and I have JOINT LEGAL CUSTODY which is defined as "Legal Custody means the responsibilities associated with raising a child and includes such questions as religious upbringing, school choice, and medical care." RELIGIOUS UPBRINGING !!! Aaron and I talked and I agreed to not interfeering with him taking the kids to church and he agreed that the kids would NOT be baptized until after they were 18 and could make that decision for themselves. I am FURIOUS !!! Is there a way I can have this shit reversed ?? I am so livid that I want to go to court and reduce Aaron's visitation to get the kids back Sunday Morning so he can't take them to church anymore. GRRRRRRR I am so livid that I don't know what to write .. I am gunna go .. until tomorrow .. XoXoX