Welcome back to the Church! After reading your original post I have a few suggestions:
First, I would make a thorough examination of conscience, there are many versions available online, but something like
this one is a good example. Since you’re unable to receive baptism at this time, for the time being, you may want to consider what is known as
baptism of desire.
Second, the reason why it is important to discard anything in your apartment that is offensive to God is because, certain items, however innocent they may seem, are open doors for the demonic. From personal experience, demons will enter anywhere they are welcomed. Moreover, if one truly loves God they wouldn’t want to hurt Him by owning items that are offensive to Him and contradict the Faith. This is also a sin against the First Commandment. Furthermore, Psalm 96:5 states that the gods of the Gentiles are demons. With that said, by owning items that represent pagan gods, Hindu and Buddhist statues for example, not only are they sinful but by their presence alone, they operate as a green light for the demon that is associated with the statue to enter your home.
Third, in regard to the discovery of several bats in your apartment, I should tell you that many saints experienced demonic attacks in the form of animals. St. Faustina was harrassed by black cats and huge black dogs, St. Jean Vianney’s arch nemesis were rats and St. Anthony of the Desert battled a variety of animals and beasts. This is all to say that demons
can take the form of animals.
While I cannot confirm nor deny this in your case, unfortunately, I have experienced it myself in the form or birds, mice and bats. The mice found pleasure not in food, but conversely, in desecrating religious objects. In truth, they urinated in front of religious images, soiled religious books and bit off the leg and two fingers that were once raised in a blessing on my Baby Jesus statue. Poor Baby Jesus. Confirmed by my spiritual director at the time, it was all because I had items within my home that offended God and He thus allowed the demonic mice to enter and torment me since I gave them permission by virtue of possessing the sinful items. Once I cleaned up the house they immediately disappeared.
Lastly, you would do well as others have suggested to pray the Rosary daily and I would advise for educational purposes to listen to talks by exorcist, Fr. Chad Ripperger.
This one would be a good place to start.
God bless you