Being rigid about anything is a sign of giving in to old age imho. I also try to be OK about religious belief in others, because I tried to have belief myself for a long time, until I finally admitted to myself that religion just doesn't 'take' on me. I understand the social and traditional aspect of religion, and understand why it would be hard to give that up.
With politics though, my life experience has led me to remain left wing, because I have seen over the years the harm to ordinary people that right wing policies can do. When I was young, I tried to go away from these views because they were my parents' politics, but my investigations, when I was trying to become a Tory, just made me more of a Labour supporter. Over the years. I have been horrified at the way most of the press supports the right wing and distorts news that would support the left.
So, I've ended up a dyed-in-the-wool, somewhat cynical left wing atheist.
But I'm open to argument......