It's probably accurate to say that 'confessionalism' in church is no longer popular. In certain contexts, it might be thought that the unity of the local Church is better served if we don’t ask her to subscribe to a set of agreed doctrinal positions. We might identify several reasons for this. Some of those who attend non-denominational Churches used to belong to institutions such as the Church of England (especially those belonging to the older demographics). These denominations do have their doctrinal standards (e.g. the 39 Articles) but today they are largely eschewed in favour of a more forgiving spirit of ‘unity in diversity’. Meanwhile, the younger demographic are either apathetic towards such doctrinal standards (perhaps because they have never had a confessional attitude modelled to them), or they’re positively ambivalent towards such standards. This ambivalence might be partly explained by the theological emphases of the emerging church movement. This movement, though waning in its influence, is not exactly keen of doctrinal specificity. (Peter Rollins’ IKON Church, for example, a famous emerging congregation, has hosted a poem on its website in which it’s said that “D-O-C-T-R-I-N-E is s-u-f-f-o-c-a-t-i-n-g me”, followed by: “Wearing our creeds, Wearing our beliefs, Wearing them tightly, ‘Til We are barely breathing”.)
Being a confessional Church isn’t always popular in today’s world. That much is certainly clear. But I suggest that, despite all this, choosing to adopt a confession of faith is still the most Scripturally, historically and practically consistent decision to make.