As I'm sure you would agree, no one should struggle to merit his way into Heaven. However, the true new believer has been given a new heart. That heart will naturally lead the person to the ways and things of God. Sure, there will be struggles along the way, but the basic premise of the new heart is that it is disposed of to do God's will:
Ezek 36:26-27 : 26 I will give you a new heart and put a new spirit in you; I will remove from you your heart of stone and give you a heart of flesh. 27 And I will put my Spirit in you and move you to follow my decrees and be careful to keep my laws.
No one should struggle?
What translation of Scripture could you possibly be reading? Everyone struggles; everyone must persevere until the end. I don’t get it, FK. Are you reading something by Jacqueline Susanne title The Bible?
Therefore let us not sleep, as do others; but let us watch and be sober. For they that sleep sleep in the night; and they that be drunken are drunken in the night. But let us, who are of the day, be sober, putting on the breastplate of faith and love; and for an helmet, the hope of salvation. For God hath not appointed us to wrath, but to obtain salvation by our Lord Jesus Christ, Who died for us, that, whether we wake or sleep, we should live together with him. Wherefore comfort yourselves together, and edify one another, even as also ye do." -- 1 Thessalonians 5:5-11"Ye are all the children of light, and the children of the day: we are not of the night, nor of darkness.
"Unto you therefore which believe he is precious: but unto them which be disobedient, the stone which the builders disallowed, the same is made the head of the corner,
And a stone of stumbling, and a rock of offence, even to them which stumble at the word, being disobedient: whereunto also they were appointed." -- 1 Peter 2:7-8
I don't know how you can expect that of a RC. :-0