There was a time when it was harmless to read those other writings. In 1960 Christians, and non-Christians, knew what the Bible is, and what it isn’t. Hollywood was making movies like “Quo Vadis.” Any group that tried to add or subtract books to the NT was labelled a cult.
This is not the world we live in today. The secular culture is not inclined to borrow ideas from non-canonical books to help inspire those who are committed to the actual Scriptures,or to evangelize people to the Church. The secular culture gives increasing attention to those books in order to dilute the impact of the real ones. Some New Testaments are being printed now with those other gospels inter mingled with the 4 “traditional” ones. In a decade, you will have different Protestant denominations, congregations, or individuals choosing their own canons. You may hear some say “the Gospel of Mathew may be inspired for you, but not for me; I am inspired by the Gospel of Mary. I also have added these other epistles that empower women, but no longer have room for some of Paul’s writings”.
So, unless you are a really mature saint and scholar, flirting with those other books isn’t harmless anymore. Trust me, they won’t - nowadays - lead you to Quo Vadis.