Christians should take part in gay pride to promote this message of acceptance and tolerance to other people out there. Even one voice can make a difference, which is why we need to work towards creating a change collectively.
The LGBTQ community has been struggling with decades of injustice. However, in the past few years, it has become increasingly important to talk and share about gay pride. Of course, the first step is to educate yourself and then share what you learnt with other people.