The correct option is 1 and 3 only.
Explanation
Article 25 of the Indian Constitution guarantees the freedom of conscience and the right freely to profess, practice, and propagate religion. However, these rights are not absolute and are subject to public order, morality, health, and other provisions of Part III.
Statement 1 is Correct:
The "freedom of conscience" refers to the absolute inner freedom of an individual to mould their relation with God or creatures in whatever way they desire. This inherently includes the right to be an atheist, an agnostic, or to choose not to follow any religion at all.
Statement 2 is Incorrect:
The right to freedom of religion is not absolute. Under Article 25(2)2 only, the State retains the power to make laws providing for social welfare and reform. This allows the government to interfere in religious practices to eradicate social evils such as Sati, bigamy, devadasi, or untouchability, even if they are sanctioned by religious custom.
Statement 3 is Correct:
Article 25 grants the right to "propagate" religion, which means to transmit or disseminate one's religious beliefs to others or to explain the tenets of one's religion. While the Supreme Court in Rev. Stanislaus v. State of Madhya Pradesh (1977) clarified that there is no fundamental right to convert another person (specifically through force, fraud, or allurement), the right to persuade people through the peaceful exposition of tenets is considered a part of propagation.
Key Takeaway:
Article 25 protects the freedom of conscience and the right to propagate (transmit beliefs), but it does not grant a fundamental right to forcibly convert others. Furthermore, religious practices are subordinate to the State's power to legislate for social reform and public welfare.