1. First class religion

    That religion is first class which trains you to love God. And by this religion you will become completely satisfied.

    If you develop your love of God to the fullest extent, you will become a perfect person. You will feel perfection within yourself. You are hankering after satisfaction, full satisfaction, but that full satisfaction can be obtained only when you love God. Loving God is the natural function of every living entity. It doesn’t matter whether you are a Christian or a Hindu or a Muhammadan. Just try to develop your love of God. Then your religion is very nice. Otherwise it is simply a waste of time (srama eva hi kevalam [SB 1.2.8]). If after executing rituals in a particular type of religion throughout your whole life you have no love for God, then you have simply wasted your time.

    From The Journey of Self-Discovery by Srila Prabhupada