Have you ever heard of the No True Scotsman?
Since we’re at it, and I hope this is still a bit on topic, how would one develop a relationship with God? To me, it always seems like a one-sided approach.
Yeah, I saw that one coming

While perfection is not something reached, but rather something strived for, we still must define what the ideal is.
A relationship with God may seem like it is one sided at first, but as one gets closer to God, we begin to see His influence in our lives and come to understand that we were never actually the ones to make the first move; that God from eternity was calling to us and drawing us in to Himself and that we were merely answering that call, though we knew not what it was.
Humanity has a knack for arrogance and attributing all successes to their own efforts. As one develops a relationship with God, they begin to see this unravel as they gain humility and begin to understand God’s ever present grace within their lives.
Learning the ins and outs of Catholicism and Christianity and studying all the rich history and teachings they offer can give one a much better grasp on God and help them to gain an infantile conceptualization of Him, but a relationship with Him comes through prayer and the sacraments.
Many volumes have been written on how to grow closer to God, so I would fail miserably if I were to attempt to explain it online, but for me personally, the recipe includes confession, adoration, the Eucharist, silence, and striving to find God in all things, as these have done the most for my relationship with Him.
If someone truly wants to go deeper with God, I would highly recommend reading
The Power of Silence by Cardinal Sarah,
Fire Within by Thomas Dubay, and Augustine’s
Confessions
I did not know we have those feasts. Saints, are they?.. amazing!
Did their children also become saints?
St. Abel’s feast day was actually yesterday, and in Christian tradition, Seth the Patriarch is commemorated as one of the Holy Forefathers and appears in Luke’s Geneology of Jesus. His feast day is traditionally held on March 1st.
As for Cain, the Church does not define or teach that any specific person is in Hell, so I pray that he was able to repent and amend his relationship with God.