If it was Grandpa's intent to stir up a lively discussion, he succeeded. If it was his intent not to be insulting to believers in the OP, he did not succeed. Appear to accuse folks of using their relgiion as a crutch, and many will see that as offensive. But I can accept that he didn't intend to be insulting.
I don't accept that some others who have posted on this thread did not intend to be insulting.
Because Jesus practiced the rituals of his faith, we can conclude He had no problem with us practicing ours. Because Jesus was so nonjudgmental re the beliefs of others, we can assume He is okay with ours when they are for the purpose of pleasing or understanding God. I don't know but Avatar may be far more of a literalist than I am when it comes to scriptures. We would probably strongly disagree on the meaning of various texts of the Bible. But we share a common bond in understanding spiritual discernment and experience.
But there is a big difference between a crutch and faith. One suggests weakness or disability suffered by some and not by others. One is a concept of a relationship that offers a kind of support and underpinning that allows imperfect beings to be better than they otherwise could be and that enriches their lives in ways that nothing else can do. One is not the same as the other.
When you look at all the great and small charities out there all over the world that exist for no other reason than to offer hope, comfort, and material help to people regardless of who they are, almost all will have Christian underpinnings. Whatever you think of, however wrong or imperfect you see individual Christians to be, their legacy and the difference they make is difficult to ignore. I have to believe there is a force driving that which no other faith can claim. That is not a crutch. That is real and profound and valuable.
At the same time, I see all religions as having at least some pieces of the truth and I will not presume to judge those who embrace them. That job belongs to God.