A skilled mathematician might take great pride in watching the progress of their child's mathematical or scientific mind. Some might even help their child along by presenting them with equations beyond the usual capacity of their current age. But children do not always inherit the skills or hobbies of their parents. A child who is learning multiplication might not want the additional stress of algebra.
Childhood is a rather defining period of time. We will often maintain associations from this period forever. If a child rejects algebra, and the parent continues to pressure him with it, he will maintain contempt for algebra, and perhaps, never become a mathematician. If you want your child to pick up mathematics as a defining element, the child must first enjoy or even love mathematics. That can only happen on a basis of the child's decision. You will not force him to like something.
Likewise, the Christian parent cannot force a child to enjoy Christianity. If it becomes clear that a child is not taking church seriously, it is absolutely the duty of the parent to engage in an honest discussion. If indeed, they do not like it anymore, let them make the decision to leave.
If church is forced on somebody, they will regard church as a chore. Every time that they are forced to go to church instead of sleeping in, spending time with their friends, or whatnot, they will hold it in contempt. They will become more angry with church every time they are brought against their will.
Nobody can be forced into enjoyment. It is the parents responsibility to ensure that their children have a strong understanding of the Christian doctrine. This can be accomplished through a series of home discussions rather than church sermons. Continue to discuss church; make sure they understand who Jesus is. Make sure they understand why they should believe; by this I mean the factual evidence supporting Christianity.
Parents need to teach their children the Cosmological argument, the Anthropic Principle, Creation science, etc, lest they look at the Bible as a myth. They will grow into adults with strong opinions. The responsibility of the parent is in which strong opinion they will have.
Further, many of the non-biblical strictures that Christianity applies are best forgotten. If you do not have a better reason than "Well, that is just how we have always done it!" then it does not need to be done. If you cannot support an action with a foundation, then you just appear to be a fool who does what they do because everybody else is doing it. (This is why I make a point to put my elbows on the table. Give me a strong argument against it; a foundation or a even one reason, and I will consider removing them.)
Eventually, your child will make a decision. You can either plant a seed of hatred toward church, or a seed of knowledge through patience. Be steadfast; give your child the desire to love God over time, rather than an angry attempt to force immediate love.
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