Assalamu Alaikum, welcome to Islam and to this forum. I too reverted to Islam from Christianity over 25 years ago. In growing up, my family was Christian, but they weren't particularly religous. Still most were quite upset with me for becoming a Muslim even though I had been the most religous among my family when I was a Christian.

I can imagine that it will be more difficult for you as it seems that you have a very religous family. I am hesitant to offer advice, but I encourage you to be true to your faith and try to initially emphasize the similarities between Islam and Christianity.

(Sorry, I hadn't read all of the posts to know that you had already told your parents.)