Well, the original Ba'al worshippers, in the Old Testament days, threw their children into the sacrificial fires.

So, if he/she is a literal Ba'al worshiper, in the true sense, then call the police immediately.

Otherwise, inform the fool of what true worship of Ba'al really is. He demands your children, plain and simple. All the other flowery bullshit they spin, with logic, Theology, etc. will not negate the fact that child sacrifice is a requirement of true Ba'al worshipper.