ISlam
catholics
Hindu's/Buddists
Oh boy
It can be, and by voting and supporting liberalism, which most Caths do, one has have already taken the mark in his heart, but it remains that the emphasis upon formal ritualized religion, including the same redundant "play" every week and liturgical calendar with their extraBiblical elements - and false gospel preaching - fosters perfunctory professions and a mere form of religion.
The wind bloweth where it listeth, and thou hearest the sound thereof, but canst not tell whence it cometh, and whither it goeth: so is every one that is born of the Spirit. (John 3:8)
The life of the church in the NT is one of being led by the Spirit in obedience to the Word (which i fall short in), and there is a reason the Spirit only mentions one specific day that the Christians met on, while observing "days, months, times and years" (Gal. 4:10) was a mark of declension. And the meeting described in 1Cor. 14, in which all men may have something to share by the Spirit, in order, is not something seen in most any church today, due to our need for further reformation.
Someone once said that we should order our lives (in such prayer and faith-dependance upon God) so that if the Holy Spirit was removed, all would fail.
Then there is the story of a Chinese Christian who after visiting many American churches (with their pomp and ceremony, or hype) wryly remarked, "The amazing thing about American churches are the wonderful things they can do without God."