A seculasr Jew once asked a religious person “what would be the very last thing you would give up about Judaism if you had to” (G-d forgive).
The person answered without thinking twice: Shabbos. The secular Jew was shocked to hear this and when asked why he was so shocked answered: Shabbos is the first reason why I don’t think I can be religious. To make a long story short- that person started to become religious after hearing the answer to their question.