Can someone end up leaving Islam through neglect?

Converting to Islam is a simple process: say the shahada (testimony of faith) and mean it. (There's a bit of a debate about witnesses: https://islam.stackexchange.com/q/16920/17163) However, my experience is that there are a lot of requirements for staying within the "folds of Islam", such as not flatly contradicting an Article of Faith . **Question**: Can someone end up leaving Islam through neglect? I'm envisioning a hypothetical Muslim, who accepts Allah as the unique God and Muhammad as His Prophet, but simply does nothing regarding their religion, simply never thinking about Islam. Their day-to-day decisions are unaffected by their religion. If I understand correctly, one can still be a Muslim, yet only uphold the first Pillar of Islam (i.e., faith), which doesn't require any particular action, just belief. I.e., one is still a Muslim even if one does not pray, pay zakat, fast during Ramadan, and perform hajj.