Where thinkpad?
No. Conservation of mass and energy only prohibit the total mount of mass and energy changing. The universe could have always existed with that mass and energy. We have good evidence that a lot of mass and energy was spread out by the expansion of a much smaller universe around 13.8 billion years ago, but we don't know what the universe was like before that, it could have always existed, or it could have been formed by the collapse of another universe, we don't know for sure.
Anyway, the laws of physics are just empirical observations, they have been proven wrong before. Einstein's general relativity disagrees with Newton's laws of motion and, further study reveled that Newton was (very subtly under normal conditions) wrong.
People with faith definitely have quite a different world view to me but I doubt that leads to a happier life. Christians might find satisfaction in following Jesus and hoping for heaven, but I can do the same by finding a fun hobby. I could never find meaning in what comes down to old myths and legends, so instead of hoping for a good afterlife, I can just do something meaningful now.
I doubt that hoping for a good afterlife is all that happy of a life, in fact I have seen it lead to dissatisfaction on people leaving a religion beleaving that they might have wasted a good chunk of their life. All research I am aware of points to happened being determined by biology and shows that doing something provides much more satisfaction then hoping you're right.
If someone doubts their faith it can result in a lot of misery because of the sunk-costs fallicy, being terrified that if the religion is wrong they have spent a lot of their life chasing a fairy tale.
Should be quite easy to remove any WiFi/cellular/satellite antennas from the car's computer. (Might be trace/chip antennas, so make sure to get those). If you're extra paranoid, get the GPS antenna too, so it can't simply record data indefinitely.
Might take a few hours to go through the car to make sure you get everything, but you won't be limited to super old cars.