Posting this in “Family Life”?? Okay, fine.
Well, in charity, I will assume you’re not trolling.
You could convert to the Faith…basically, as long as you can truthfully say that what is said in the 3 historic creeds (the Apostle’s Creed, NIcene Creed, and Athanasian Creed) are what you believe in your heart of hearts.
Having said that, there is a little thing in canon law that says:
Can. 750 §1. A person must believe with divine and Catholic faith all those things contained in the word of God, written or handed on, that is, in the one deposit of faith entrusted to the Church, and at the same time proposed as divinely revealed either by the solemn magisterium of the Church or by its ordinary and universal magisterium which is manifested by the common adherence of the Christian faithful under the leadership of the sacred magisterium; therefore all are bound to avoid any doctrines whatsoever contrary to them.
§2. Each and every thing which is proposed definitively by the magisterium of the Church concerning the doctrine of faith and morals, that is, each and every thing which is required to safeguard reverently and to expound faithfully the same deposit of faith, is also to be firmly embraced and retained; therefore, one who rejects those propositions which are to be held definitively is opposed to the doctrine of the Catholic Church.
Can. 751 Heresy is the obstinate denial or obstinate doubt after the reception of baptism of some truth which is to be believed by divine and Catholic faith; apostasy is the total repudiation of the Christian faith; schism is the refusal of submission to the Supreme Pontiff or of communion with the members of the Church subject to him.
English translation of the pertinent sections:
If something is written in the Scriptures or if it is part of Sacred Tradition (with a big “T”), if it is an approved part of a formal doctrinal declaration by an Ecumenical Council, if it has been formally and infallibly defined by the Pope…you have to believe it with Divine and Catholic faith.
Divine and Catholic Faith means that you believe it down in the depth of your heart and do not doubt it.
If you, after you are baptized or received into the Church, obstinately deny or obstinately doubt a truth that is to be held with Divine and Catholic Faith then you are a heretic. Obviously, being a heretic would place you in a state of mortal sin.
If your heresy is manifested in the external forum (i.e., you start proclaiming that your views and not the Church’s views on a matter that must be held with Divine and Catholic Faith…or, particularly, if you start trying to win Catholics over to your point of view), then you will suffer laetae sentintiae (i.e., automatic) excommunication. BTW, laetae sentintiae excommunication happens from the point when the act was committed. No formal decree, ecclesiastical trial, or anything else is needed. It just happens.
And, well, guess what? The Church’s teachings on abortion and homosexual conduct both fall within the realm of those things that must be believed with Divine and Catholic Faith.
So if you are received into the Church, basically, you go virtually immediately into a state of mortal sin. Since you don’t plan on repenting of holding those positions, it’s not something that can validly be absolved in confession. And if you start trying to convince people to agree with you, you are automatically excommunicated.
Bottom line is: for the sake of your own soul, you need to resolve your issues with abortion and same sex “marriage” before considering entering into the Church.
Maybe what you could do is to try to understand, on a theological basis, “why” the Church teaches as she does. Go at it from the perspective, “I know that the Church teaches this, I know that the Church is the Bride of Christ and is right on these issues. Maybe if I understand why, I can come to believe as the Church believes.”