Ann,
You mentioned your granddad was a 33red degree Mason. That means he took degrees in the Scottish Rites, after receiving his first three degrees in the Blue Lodge. That is one path of Masonry. Another path is the York Rites, in which I took my degrees. That leads to the final degree of Knight Templar, which is where I ended.
I respect your granddad for both his Masonic journey, and his coming to Christ later in life. If he felt that Masonry was incompatible with Christianity, then I respect his opinion there took though I disagree with it.
A point I should have mentioned in my earlier reply to you is that the Knight Templar degree is the only Masonic degree that is explicitly Christian.