While I appreciate the concept of the idea, the fact is that plenty of children were raised in exactly this way, by parents who made sure their children knew about Christ, had relationships with Christ, talked to the children and the children knew they could talk to the parents without embarrassment or punishment, etc., and those children still went out and did wrong things, including obtaining condoms, in secret.
There is a fine line between noting that there is a Christian and Godly way to raise children and promoting it—which is helpful—and the notion that if a child does do something wrong then the presumption is all the parents did wrong; IF the parents had done thus and so the children would not have done these things.
Such an attitude hurts everybody, but especially the parents who, again, have done what they were supposed to do and now feel even more betrayed for being assumed to have the been the cause of their children’s wrong actions.