Yeah, they told me long ago that one day in the far away future there would be machines that wash your clothes, boxes that let you talk to people who are miles away, and carriages that move without any horses in front!
I mean sure, those all exist now, but we all know God put them there. Science had nothing to do with it.
Science has given your grandparents a wonderful future already. Why would we be suspicious of something that has provided us tangible results? Seventy years ago, you would have been worried about your children contracting polio. Perhaps you could pray to protect them, and maybe that would work, but it is thanks to the science of vaccination that you don't have these fears.