All are very dangerous, but I chose ecumenism. Many people think here in Hungary that Christianity, Roman Catholicism, Unitarianism, Jehowah's Witnesses etc. are all the same. In fact, ecumenism is a very popular heresy among the leaders of so-called "historical churches" (I mean the Reformed and the Lutheran Church of Hungary). They say, it doesn't matter, what you do - just do it in an ecumenical way!

Élek pedig többé nem én, hanem él bennem a Krisztus; a mely életet pedig most testben élek, az Isten Fiában való hitben élem, a ki szeretett engem és önmagát adta érettem. (Gal 2:20)