This seems to be something that a lot of parents fail at. I spend a lot of time with people who identify as LGBT to one degree or another, and they all receive different levels of support from their parents. I personally don’t receive much support from my parents. The atheists that I know also receive different levels of support from their parents. Many of the people I know were raised in secular families, so they have no issues, but this is not the case with all the people I know. Even some of the people who prefer not to label themselves aren’t always supported. As such, I know a lot of people whose love for their children is very much conditional. I find this very sad.
As a parent, you want what’s best for your children. When your children turn away from the beliefs that you hold, or when they do something that goes against your beliefs, it is understandable to be afraid for them. But abandoning your children, or neglecting them, or making them feel as though they can’t rely on you, is not a solution to this problem. Be afraid for your children if you must, but love them unconditionally regardless. Hurt your children as little as possible, even if you feel hurt by them. You are their roll model. You are the person that your child should be able to turn to in times of need. I don’t remember the last time I was able to rely on my parents for anything. And I know a lot of people who don’t have the support of their own parents.
As a result of my experiences and the experiences of those around me, I refuse to allow myself the possibility to love them conditionally. I want to be there for any children I have. I want to be the first person they turn to when they need support. If they choose to become theists, or they get into a lot of trouble (these are the only two things I can think of that would genuinely bother me), I’m not going to let that get in the way of my relationship with my children.