Learning to accept what I cannot change.

I feel like I am caught up in a funny test of some sort.  The universe is "just checking" to see how tolerant I really am. 
Back before I had children I would look at stories of LGBT people and internally shame their families for not accepting them.  I would say, "Of course we will continue to love our child if s/he is gay." 
Well, the universe threw us a curveball and gave us an atheist.  I have been running through the gamut of emotion on this one.  What have I done wrong?  How did I fail my child?  How can I "fix" this? 
I have tolerance for and acceptance for people who are gay.  I've basically ignored atheism but when it comes down to it.  I want to change atheists into a believer of any kind.  Jesus, Mohammed, the universe, nature, pick a deity and we're good.  This not believing in anything thing kind of freaks me out. 
I am learning acceptance and it isn't super comfortable.  I want my child to believe what they believe because it is important to them and it feels right.  Not because I drill it into them.

(These are my preliminary thoughts on this topic.  I will add more as time goes by.)