Two things I have learned in therapy:
1. We are all on our own separate journeys. No one can carry us. We have to walk our own walk.
2. Don't work against yourself.
Lee, they are on their own journeys. As a parent, you have no power to change their journeys.
Feeling guilty about things you cannot change would be to work against yourself.
Something I read long ago. Regret and guilt are different things. Regret can be productive. Guilt can destroy you. It's healthier to say, "I regret that I raised my children as Jehovah's Witnesses," than to say, "I am beating myself up with guilt over raising them as JW's and the fact that I cannot change that." Regret? Much lighter. Guilt? A heavy burden that helps neither you nor them. Place them in God's hands or if you don't believe, place them in the hands of the cosmos. Recognize the limits of your power. Accept the limits of your power. Do not work against yourself. Just love your kids and express empathy and compassion when appropriate.