Don’t neglect to do the good works which God commands.

Discussing and debating religion is not as important as keeping God's Commandments.  In essence, they amount to claims of faith.  In other words, everything is important.  But the most important thing, is to keep God's commandments.

1 Corinthians 7:19
Circumcision is nothing, and uncircumcision is nothing, but the keeping of the commandments of God.

Galatians 5:6
For in Jesus Christ neither circumcision availeth any thing, nor uncircumcision; but faith which worketh by love.

Faith which works by love is the equivalent of keeping the Commandments:

John 14:21 He that hath my commandments, and keepeth them, he it is that loveth me: and he that loveth me shall be loved of my Father, and I will love him, and will manifest myself to him.

And it is they who will be saved:

Revelation 22:14

Blessed are they that do his commandments, that they may have right to the tree of life, and may enter in through the gates into the city.

In my opinion, the most important thing to God is that we keep His Commandments. Those Christians who keep His Commandments will be saved in this life by virtue of the Sacraments and in the age to come by virtue of the righteous judgement of God.

Those non-Catholics who keep His Commandments will be saved in the age to come by virtue of the righteous judgement of God.

Those who do not keep His Commandments will not be saved. For God, actions speak louder than words. Speaking and teaching is great, but don’t neglect to do the other good works which God commands.