Read and study the book of Jude. It's only one chapter, it's one of the shortest books in the bible. Here's a link: https://www.biblegateway.com/passage/?search=Jude&version=NABRE
Jude wrote the letter in response to Gnosticism creeping into the Christian church and subverting it. He deemed it such an extreme threat to the church that he quickly got this one letter out, planning to write more about it. He was unfortunately martyred before he could write more, but his epistle helped the early church defend against a complete takeover.
The reason Gnosticism is bad is because it conflicts with gospel teaching about good and evil. It denies God's power (instead equating the devil with God). It denies Jesus's suffering and resurrection. But worst of all, it has people focusing on themselves and others.
We're not called to get ourselves in the perfect spiritual ascension or whatever we're called to lift up the poor and the lost. We're not meant to detach from the world, unless we're using that time to pray for the world and for the church. If we're just meditating and working on ourselves all the time, the love of the gospel can't spread and the light within us won't inspire others to open their hearts to God.
Gnosticism/Buddhism is narcissism and detachment from the souls we're meant to fight for. It's incompatible with Christianity, and though they wear a cloak of peace, they invert souls into the devil's most wicked spells of self abasement.